Out of all the tourist attractions I have taken visitors of San Diego to, the unanimous favorite has always been SeaWorld San Diego.
Some people might brush this experience off as too similar to other parks such as Marine World, but SeaWorld simply is not the same and is a great experience for adults and kids.
There are several rides and many animals to view such as dolphins, killer whales, penguins and turtles. There are also several very entertaining shows such as the Shamu show.
But there are also interactive activities such as petting and feeding the dolphins. This is one of my favorite things to do and I can still remember the thrill i felt at touching my first dolphin.
The best time to is in the summer. Not only are their extended park hours, but their are shows that are only shown in the summer. For instance, cirque de la mer, very reminiscent of cirque du soleil is both impressive and free. There is also a nighttime shamu show which only happens once every night. Summer nights end with a great ten minute firework show.
For adults, because SeaWorld is owned by Anheuser-Busch, you can also sample free alcoholic beverages and go to beer school. There is a Anheuser-Busch center shortly after the entrance which has some souvenir shops, restaurants and of course, beer samples!