In my best estimation, of the ones I use regularly (keeping in mind that's relative, since I live ~1,300 miles from the nearest station):
1. SIM
2. PRB
3. SLO
4. LAX
5. SAN
The rest of my 13,000 or so miles have been long-distance trips that have resulted in an actually relatively few number of stations that I've visited multiple times--NYP, BOS, WAS, SEA, and PDX. (I suppose I've been to CLT twice if you count that I started and ended a loop trip there; I'm not counting stations at which I had long layovers/stopovers and so may have left and come back while on the stopover--that would include CVS, CHI, and PHL.)
Last edited by jackal; Dec 5, 2009 at 7:27 am
Reason: clarification