I stayed at Monte Carlo for 3 nights and I spend 3 days at the pool. The vibe at the pool is very chill. the crowd here seems more mature, there is a pool, a Jacuzzi, a wave pool and a lazy pool. There are limited area where the sun is shining on and to get a tan.
There is security at the gate to check that you have a monte carlo card and they also check your bag (not impressed).