my opinion, as a mid-20s chica is basically along the lines of what minx said;
a) see hot chica, strike up a conversation, get to know a little about her and if she doesn't blow you off right away she is probably interested in getting to know you more
b)no bad pick up lines, thats an automatic turn off, but if you are climbing and you see her at the gym, ask if she wants to climb with you or do some similar activity
c) don't bring up your ex girlfriends in the first 2 dates, thats just plan wrong, we really don't want to hear about the nice rack your ex had- even if you are talking about her climbing gear
d) dogs are major bonus points, for me anyways
this applies at the rock, at the store, in class, at the bar, etc etc etc.