In Mission Bay [1] and San Diego Bay, the calm waters make great fun of all forms of boating, from paddle-boating to waterskiing [2] to sailing [3]. Kayaking [4] is a special local favorite pastime, especially for would-be explorers of the famous La Jolla Caves.
If you plan to exit the bays for the open ocean, be sure you’re either competent to navigate a watercraft on the open sea, or have somebody with you who can do it. Watch the weather reports, and pay attention to local experts.
Links:
[1] http://www.moon.com/destinations/california/san-diego/sights/mission-bay
[2] http://www.moon.com/destinations/california/san-diego/sports-and-recreation/boating/power-boating-and-waterskiing
[3] http://www.moon.com/destinations/california/san-diego/sports-and-recreation/boating/sailing
[4] http://www.moon.com/destinations/california/san-diego/sports-and-recreation/boating/kayaking