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Sorry I'm not sure what you mean by the circles

Do you mean the beaded parts? If the beaded parts protrude more than the rungs then it might not work sticking something to them

Basically they do better with solid ramps or steps. I'm wondering if the steps out of the sand bath might be a little bit steep as well - or you could maybe put more sand in so it's not so steep?
Something like these bendy bridges might make better ramps instead of the ladders

Or if you like the natural look you can get the bark wood bendy bridges, but they can have gaps sometimes so check for those and stuff the gaps with paper or moss to make them safer (avoids a foot getting caught)
Coloured bendy stick bridge.