Phil found a great set of sites that let you out into the great ourdoors in San Diego.
San Diego Kayaking & Bike Tours in San Diego with Hike Bike Kayak San Diego (866) 425-2925. . They run a whole series of tours. 10% off for bicycling and hiking.
Ohter things that they have are: “bike tours”:http://www.hikebikekayak.com/Biking_San_Diego.php including the La Jolla Plunge that leds you decend 3.5 miles down La Jolla. There is also a coastal bike tour. They have custom tours as well. Full day rentals at $55. They rent both Gary Fisher mountain bikes and Feld road bikes. They have kayak rentals there too.