Head to Lake Berryessa in Napa for this beloved open water swimming tradition, which has been bringing together hundreds of swimmers since 1981 through Davis Aquatic Masters. You'll have the flexibility to tackle either a 1-mile or 2-mile loop in refreshing freshwater waters (around 68-72°F), starting from deep water with wave starts based on your seed time and safety support on hand. This Pacific Masters Swimming-sanctioned event requires USMS membership or a day pass, along with a mandatory safety briefing, with races kicking off at 9:30 am for the 2-mile course and 11:50 am for the 1-mile course.