tell me about nye at the rio? is the viewing good? i imagine voodoo lounge or on top of a parking garage??
If you're talking about scenery, Voodoo Lounge terrace has some of the best views of the Strip available (from the back). Voodoo Lounge sits on the 51st floor of Masquerade Tower. Not actually 51 floors due to the absence of the number "4" on the elevators (bad luck # to Asians). You might want to call ahead though. They used to have a dress code and a charge to go up the elevators.
You'd definitely have a great view of the fireworks. The Concierge always gave us passes to get into VooDoo when I travelled with girlfriends, not sure if they do the same for men though.