Each of the UCs produces at least one Mid-Distance or Distance qualifier each season for NCAAs. Not too versed on each program but do understand the vibe...
Riverside - hot as Hades and more agriculture. Not the nicest campus
Santa Barbara - Absolutely beautiful location right on the lagoon/beach and great social scene
Los Angeles - prestigious, big campus with a massive variety of things to do nearby
Berkeley - very very "liberal" if that matters to you and not far from San Francisco
San Diego - moving to D1 soon and has an enormous, beautiful campus. Very academic environment and not too far from the San Diego social scene
Irvine - super academic and inland. Gets decently warm. Not much to do there, but beats being stuck in Riverside.
All of these UCs have great facilities with the exception of Santa Barbara. They're doing work on their track.
Consider Can Poly SLO too if I were you .