This is where I swam today. The Belvedere Lagoon. I had heard rumors, talk, whispers of such a place. But, you have to know someone who lives on the lagoon to let you use their dock off the back of their house. I don’t know lots of people in Tiburon/Belvedere (shockingly). Today I got an invite. The lagoon is fed from the Bay, but it’s cleaner and treated by some chemical for algae and it’s like 10-12 degrees warmer than the Bay — no wetsuit needed — and you can do long 45′ laps around it. If you can, wrangle an invite from someone.