Fine questions.
I've done the whole Vegas thing many times before, so it's not like I'm
dying to do it all again. This trip is going to be about the WSOP for me - going into it anyway, that's my focus. I doubt I'll even play poker before Sunday (althought I'm sure I could be talking into joining you/others for a while in some sort of cash game somewhere). After I bust out, I'll either play some cash games or maybe get in one of the $1000 or $1500 second chance tourneys - that went well for me last year.
For non-poker, I'm doing NOTHING on Saturday night, but for Thursday/Friday, I'd definitely be up for going out. Hopefully there will be some cool WSOP type parties to go to (UB's was a lot of fun last year), and drinking with a bunch of TPers sounds AWESOME.
Really, once I bust out of the Main Event, all rules are off. I'm just planning on playing it by ear, I guess. I have friend who live in Vegas - I'm going to be staying with them for part of the time I'm out there, and I have a room at the Hilton (long story) for Sat-Sat. I'd like to spend some time with them and maybe catch a good show, but really, I'll be up for whatever.
As for $$ - I'll put hotel, car rental and lots of other stuff on a credit card, so I won't need cash for that. For poker and daily spending money, I haven't really thought about it yet, but I'll probably only take $1000 with me to start (maybe a bit more) - and as pshabi said, the old ATM card. I don't mind making daily $500 withdraws from casino ATMs - these are good records to help document your "losses" come income tax time.