Get your tickets to see a game at Viejas Arena. If there's nothing on while you're there, you might like to check if there's a guided tour of the facilities.
Viejas Arena has an entry fee and is a well-known attraction in College West. There are lots of other interesting things to do close by, so why not stick around a little longer? San Diego Zoo, Balboa Park and SDCCU Stadium are also on the itineraries of many visitors.