I have stayed there up until May this year. My room is always clean, and well maintained. I would not ask for an upgrade until I actually saw the physical room

Depends on what you think is cold water - I'm from New England and will swim in Florida waters in January but local Floridians think it is too cold. I would recommend calling the hotel to ask what will be open. We were there in early November and the hot tub and pool were open, but the water slides were closed for the winter. The hot tub was great. I didn't try the pool but folks also using the hot tub said the were running back and forth between the pool and hot tub to warm up (they are both outside). Weather mapping puts daytime temps in the 60s-low 70s (16-18 Celsius) in early March. It is the desert so it drops in temp quickly at night - as soon as the sun goes down. That said, Circus Circus has an indoor amusement park (check ticket price) and arcade that the are good for the 4 yo and multiple free daily short shows that are family friendly - like clowns, trapeze, etc. It is at the end of the Strip so if you want to go to the main area, like the Bellagio, you will have to take a cab with the kids or rent a car. Even with a car Vegas is a lot of walking and it is visually very stimulating. You will want a stroller for both of the kids because they will get tired very quickly. If you rent a car, get one that has pickup/drop off in the airport. The cheap rental agencies require at least one bus and 20 mins to get to. You will definitely want to go to Fremont Street in Old Vegas. Free to walk around, lots of lights and entertainment - bands, performers, etc.

Hola, revisalo en tu reserva ya que varia dependiendo del lugar donde compras