So which one has the largest in room hottubs?
Are there any big enough to use for some playing or are they all just overglorified bathtubs?

The Tropicana used to have large in room hot tubs big enough for a few people....  I am not sure if they survided the remodle  

Also the Luxor has hot tubs in some of there rooms.

The tub is huge can fit a few people in there.Paris has a big tub not as big as the New York New York.
At Caesar's Palace some of the rooms have big tubs I forget which tower.

it has a hot tub outside on the Terrace that over looks the strip

began in a hot tub at the Cosmo.  I don't know that it's the largest, but it was DEFINITELY the hottest!  Even with the three of us, there was room for more people.  BTW, Cosmo was voted "Best Strip Hotel 2012" if that helps you decide.

Have a look for yourself; link below...

http://www.cosmopolitanlasvegas.com/stay/rooms-and-suites.aspx

Also, it's been discussed at Trip Advisor:

http://www.tripadvisor.com/ShowTopic-g45963-i10-k4052460-Best_bathroom_hot_jacuzzi_sap_jet_tub-Las_Vegas_Nevada.html

xoxo,

R

-- Modified on 8/24/2012 11:11:35 AM

The tubs at the Wynn are just big enough for two. Kiwi and I played but our date couldn't fit in with us so we tied him up and he just had to watch.

I stayed in the IP "love tub" rooms a few years back. It was nice plus it could definitely fit 2 in it (3 or 4 depending on other factors) and there was a mirror above the bed (the girl I had a session w/and me thought it was a major turn on when having a session w/the mirror above us). I know some of the suites at Sunset Station had those large tubs in them when I stayed there years ago.