I remember when my kids were younger they always had difficulty climbing onto the cooler play structures. Somehow the first few steps of the entrance are the most difficult. So I just had to help them get on and they would be fine. At first this annoyed me a bit, but later I realized that this must be intentional; if the kid manages to get in/on the play structure in the first place, they'll probably be fine. If they fall when trying to get on it, they fall in the sand so also no problem. Only the kids with some physical ability are able to reach some height, the smallest have to stay on the ground