If you ask me, all the strip ones are a bit overhyped. One that sticks out for me is Canyon Ranch that in the Venlazzo shopping area. Granted, it's a fine establishment but I didn't find the services to be over the top. They're all good. Peace and quiet if you want it. Refreshments (generally no booze) and light food/fruit easily found. Places to soak, places to steam. Whatever services you scheduled will be done in a quality manner. Personally I'd look at some of the off strip ones (Palms was reasonable but no idea since the remodel; GVR, Red Rock, Rampart/JW Marriott, M and any throw Alliante in the mix, hell South Point has a decent one too).
For alternative entertainment, may I suggest
https://greatvegasbeer.com/