Boulder Reservoir

Lake in Boulder

When you’re this far from the ocean, this is where folks come to suntan, swim and play in the water. There's a big sandy beach, lifeguards and a well-maintained visitor center and cafe. Kayak, paddleboard and sailboat rentals are offered ($15 to $30 per hour) along with SUP yoga classes ($35). Be sure to bring a hat and reapply sunscreen often – there's little shade here.

Dogs aren't allowed into the park between May 15 and Labor Day.