The beach entry is great! Even when the pool is cooler they splash in the beach. My kids are 8, 4, and 3. They do great around the pool. Simple rules. No cunning on concrete. Stay on Brown part "beach" unless you have floats on (the two little ones). They climb the waterfall and jump all the time.
No worries about the accent rocks. They don't fall any more than regular really.
Our PB said all stairs and benches are free. Technically we could have done steps all a round the pool. He is the one that suggested the seat under the waterfall. If you are doing this, be careful of the depth of the seat. Needs to be deep enough for adults and not too deep for shorter people.