In addition to the info in the link from the PP, see below.
#1 opens up directly to that little sand lagoon area, but you can loose sight lines if your kids are more left in that bigger sand area. #2 is my preferred spot for keeping tabs on the kiddos. #3 offers much of the same attributes, just back, a slight bit. #4 is the least kid friendly if you're trying to maintain sight lines.
Hope that helps!
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