Personal opinion: I've stayed at most of the casinos in Reno. My best picks are the Silver Legacy right in downtown Reno or the Peppermill (new tower) somewhat south of the bowling action. Both have fantastic rooms and good restaurants. Worst is Circus-Circus - probably least expensive rooms but getting to them is a nightmare. Good luck in the tournament. If you are going to bowl against a mixed team, be sure its not one with my wife in it - she'll bowl your socks off.
George