This review is for the pool and bar (as a non-guest) only.
The Clarendon pool is open to non-guests for a nominal fee ($10) payable at the front desk, and for an additional $2, you can get a hotel towel. The Clarendon's facebook page says that if you show your ASU ID, you can get free pool access!
We paid at the front desk, but didn't get any kind of receipt or wristband, so if you're wondering if you could get by without paying... the answer is probably yes. There are public restrooms inside the lobby (walk towards the restaurant and then left down the hallway).
The tasty Gallo Blanco restaurant and bar is right there for your enjoyment too. Tuesday is "taco tuesday" where you can buy 2 tacos, get 1 free. Drinks are yummy and run about $8.00. Be sure to tell them you're at the pool so they can put your drink in a plastic cup.
The pool and hot tub are awesome... if you do any underwater swimming or floating, you can hear some retro-type music playing underwater! Woo!