"Immersive experiences where you can sauna and get in the cold water in nature, directly outdoors."

That's Sundrop Sauna founder Alex Zelaya, describing to Sonoma Magazine the vision he's chasing across Marin and Sonoma counties. He's not talking about Petaluma specifically. He's talking about a business model he'd like to replicate at multiple riverfront and coastal sites. But the first place he actually built it, back in August 2024, is a marina most Petaluma residents knew only as the spot where Lakeville Highway crosses the river's tidal reach. And in the two years since, without anyone planning it as a single project, that marina has become the far end of a trip that starts at the Turning Basin downtown and now runs as one continuous afternoon instead of three separate errands.

That's the part worth sitting with. Not that Petaluma has a sauna, or a paddling outfitter, or a new winery tasting room. It's that those three things now connect into one loop along the same six miles of water, and the river carrying you between them is doing something it hasn't done in a century: working as recreation infrastructure instead of shipping infrastructure.

The channel this all runs on

The Petaluma River was a saltwater highway before it was anything else. The Army Corps of Engineers dredged it through the early 1930s to keep it navigable for the dairy and egg trade that made Petaluma one of the wealthier towns in the country for a stretch of the Gold Rush era, cutting a channel wide enough and deep enough for commercial barges to reach a 300-by-400-foot turning basin downtown, the same basin where the U-shaped dock now called Cavanagh Landing sits. Commercial river traffic mostly went away decades ago. What's left is a tidal slough that starts at the Turning Basin, in the same reach where a floating dock and boat ramp still operate at the foot of Weller Street, and runs southwest through marsh and open water to San Pablo Bay.

For most of the last twenty years, that stretch of water was scenery. You could walk along it, launch a kayak on your own if you owned one, or watch it from the Sheraton parking lot. What changed isn't the river. It's who's using it and for what.

The paddle that makes the loop possible

The Floathouse Petaluma runs a guided trip called the Downriver Run: six miles by pedal kayak, launching from downtown near the Turning Basin and riding the outgoing tide past the Alman Marsh Trail and Schollenberger Park to Lakeville Landing Marina. It's built around Hobie pedal kayaks, which the outfitter markets as staying warm and dry through winter paddling, and the whole point of the route is that it's one-way. You don't paddle back against the tide. You end up somewhere, and that somewhere is the marina where Sundrop Sauna operates.

If you'd rather go without a guide, Clavey Paddlesports runs a rental and lesson shop a few blocks from the Turning Basin and can put you on the water solo. Either way, the mechanics of the trip only started working as a single loop once there was a reason to paddle all the way to Lakeville instead of turning around at the first bend. That reason showed up in August 2024.

What's waiting at the other end

Sundrop Sauna's permanent Lakeville Landing location runs community sessions of ninety minutes, capped at eight people, for forty-five dollars, cycling guests between a cedar sauna that typically holds 190 to 200 degrees Fahrenheit and a commercial cold plunge kept between 45 and 55 degrees. Zelaya's own path to it ran through Finland, where he spent a day at a lakeside sauna and came home convinced the Bay Area was missing that kind of built-in slowing down. Petaluma was his first permanent site. He's since added a second location at Nick's Cove on Tomales Bay, but Lakeville Landing is the one connected to a paddling route, which makes it the one that turns into an afternoon trip instead of a destination you drive to on its own.

The Floathouse has built the connection explicitly into its programming. Its winter Downriver Run listing offers a discount on the sauna and cold plunge as an add-on at the destination, with instructions to bring a bathing suit and towel or leave them in the car at the marina. That's a guided outfitter and an independent wellness business, run by different owners, coordinating around the fact that their two experiences sit six miles apart on the same water.

What the river shows you along the way

The Alman Marsh Trail, which the paddle route follows for part of its length, runs along the riverside between the Petaluma Marina and Schollenberger Park. In October 2025, a Petaluma resident photographed four river otters swimming there in a pack, stopping periodically to look around before continuing toward downtown, and the Argus-Courier ran the photos in its recurring Scene in Petaluma feature. Near the Turning Basin itself, the Bay Water Trail's site notes active heron and egret roosting sites, and asks boaters to keep a buffer distance and avoid sudden movements near them. The Floathouse's own trip notes mention a green heron that frequents the turning basin and a great egret that fishes the reeds just upstream.

None of this is stocked or curated. It's what happens on a tidal marsh that isn't being dredged for commercial traffic anymore, and it means the same six miles carrying kayakers to a sauna are also carrying an otter population that wasn't showing up in casual sightings a decade ago.

The bookend back downtown

If you want to start or finish the loop with a glass of wine at the water's edge, Adobe Road Winery has spent most of the last eight years working toward exactly that. The winery's original Petaluma tasting room opened at the Great Petaluma Mill in 2016. The city approved a new three-story riverfront building at 1 C Street in 2018, and construction dragged through COVID and a run-up in lumber costs tied to the region's wildfire years before owner Kevin Buckler brought on Petaluma-based Midstate Construction in 2024 to finish the job. As of this year, the new site is pouring wine through a temporary outdoor courtyard tasting experience on the riverfront lot while the full building, which will also house a motorsports gallery tied to Buckler's racing background, nears completion.

It's been a long timeline, but the result is a tasting room that sits directly on the water the Floathouse paddles past and the Turning Basin dock serves. You can walk from Cavanagh Landing to 1 C Street in a few minutes.

What a Saturday on this loop actually looks like

Put together, an afternoon on the river now runs something like this:

• Late morning: launch from the Turning Basin with the Floathouse or a Clavey Paddlesports rental, riding the outgoing tide past the Alman Marsh Trail and Schollenberger Park.
• Early afternoon: land at Lakeville Landing Marina, book a ninety-minute Sundrop session, and cycle between the sauna and the cold plunge with river views on both sides.
• Late afternoon: head back downtown, on foot or by car, and close the day at Adobe Road's riverfront courtyard.

None of this required a master plan. It required three independent businesses, working on their own timelines, to each solve one piece of a route that didn't fully connect until the last piece landed. That's usually how a neighborhood's daily life changes. Not with an announcement, but with enough small openings, in the right order, that a resident can finally do in one afternoon what used to take three separate trips to figure out.

If watching that stretch of river turn into something residents actually use has you curious about what else is shifting along the water in Petaluma, Daniel Casabonne can walk you through it. Request a private consultation.