I did quite a bit of research on this question in preparation for a 9/11 Vegas daytrip I made after finding a $20 R/T from IAD.

The two pools that appear to be wide open to non-hotel guests are the Flamingo and Plaza. The Flamingo is thought by many to have one of the very best pools in town. At the Plaza, said to be the second best pool downtown after the Golden Nugget, you are supposed to be able to even get towels without a problem (not sure about towels at the Flamingo).

Even at pools that check, I've heard it's often possible to just flash a smile and breeze right in. At Luxor you will definately need to show your key to get towels and for someone to pull down one of the lounge chairs that are stacked in the corners. However, the gatekeepers are sharply off to the left as you walk in and, as I found out last week, it is very easy to slip right by them. Ended up just sitting for a while with a drink at a table soaking up the scene, no swimming or sunning.

For the risk averse and/or those with impeccable charachter, I found two places that will let non-hotel guests in for $15: Monte Carlo and the Riveria. I've read, however, that Monte Carlo's pool is rather skimpy. The Riveria's pool is supposed to be fairly nice, laid back and relaxing, although the hotel attracts a high % of seniors, a drawback if you enjoy eye candy.

Lastly, there's always the Wet n' Wild water park; although this is often crowded, noisy and teaming with kids.

If you're fix'n (as they're charmingly fond of saying in Nawlins) to crash a hotel pool in Vegas, I think your best bet is probably the Flamingo.

[This message has been edited by mtm767 (edited 09-17-2002).]