The large pool is zero-depth entry into the over-sized shallow area that is roped off and serves as the "kiddie pool". The pool area is very attractive. I was not aware that the upper pool is an adult only pool, I thought that it was just designated a "quiet pool" ie., no floats, toys, or ball playing. When we were there in late January for 10 nights the upper pool was a bit warmer than the large one.