The Monte Carlo pool is not open this time of the year, some pools in Las Vegas are heated their’s isn’t one of them…It is a nice pool though, huge area(over 20,000sq ft) made up of several pools – a wave pool – swimming pool – 400ft lazy river – etc -.
Monte Carlo is a pretty nice hotel, you might want to compare it to MGM and Luxor they’re all pretty much in the same area(Tropicana and Las Vegas Blvd)..
This is the best site for info on LV. http://www.lasvegasadvisor.com you can read member reviews of hotel/casinos. Under "VEGAS INFO" click "casinos" for information/reviews