We will be staying for the first time at the Polynesian at the end of the month. My 2 DS (7 & 4) both love to play in the water. Do I need to take swim shoes for them to wear in the pool? They have shoes that they can wear to the pool but did not know if the floor of the pool is very rough or not. Also, how deep is the water at the end of the slide at the volcano pool? DS (7) is looking forward to this but is not a good swimmer. Thanks for your help!