Bike ride along the water! If you are staying at the Argonaut Hotel, there are complimentary bikes through the hotel. Otherwise, there are a ton of bike rental shops right near the hotel. Route 1 (short and scenic). Leaves right from hotel. Bike along Aquatic Park to Marina Green, stop for views of the Golden Gate Bridge and beach at Crissy Field. Turn back. Route 2 (longer): Follow route 1, but continue to bike across the Golden Gate Bridge into Sausalito. Take the ferry back! Fun, full day adventure.