Tour Mission BayWhen our family looks to vacation, we look to the water. And San Diego\u0027s Mission Bay has plenty of it. It\u0027s the West Coast\u0027s largest aquatic park\u0026#8213;4,600 acres within sight of the downtown skyline.My wife, my two young boys, and I have three days in the watery wonderland in this, our final summer hurrah. First on tap, we rent beach cruisers and explore the raucous oceanfront strand along Mission Beach\u0026#8213;tattooed hipsters, preening hard bodies, and $3 T-shirts washed with tinny reggae and briny breeze\u0026#8213;before wheeling to the quieter pathways edging the bay.Renting bikes is a good move, since we\u0027ve learned that parking\u0027s pretty much impossible. But there\u0027s always plenty of room in the water. The boys and I bodysurf and rent surfboards, plunging into happy white breakers. We paddle kayaks from Quivira Basin around to SeaWorld, the bay glittering in the late afternoon light.And we adventure on dry land too. At Belmont Park in Mission Beach, we ride the Giant Dipper\u0026#8213;the venerable 1925 wooden roller coaster. We even surf on dry land, challenging the tensile grip of our bathing suits on the FlowRider, an artificial wave created by 20,000 gallons of water rushing 25 miles an hour along a sloping vinyl surface. Skittering across the foam face on the rushing skein of water is like being transported atop a wet and rollicking magic carpet.On our last day, the four of us test SeaWorld\u0027s latest paean to fall-away thrills, Journey to Atlantis. And if our sons\u0027 happy shrieks are any indicator, the ride lives up to its billing as \u0022the most exciting attraction in SeaWorld\u0027s 40-year history.\u0022Once again, water doesn\u0027t fail us.Going at the last minuteMission Bay has more than 2,000 hotel rooms. August is peak season, but you can find last-minute deals.Stay close to the bay or the ocean for easy beachgoing.Though nobody\u0027s going to call it uncrowded, you can walk just about anywhere.