Sesame place question

Hi,I hope you don't mind me asking, but I figured you guys would have the best perspective. I have one 2 year old son. We are taking our god children (girl age 2.5 and boy age 3.5) to sesame place. We have a double stroller to use and a single umbrella stroller. Is this a good combo or would you suggest we get one of those ride on boards (there is one that has a bike type seat you can get- so really it is an extra seat but doesn't recline so no one can sleep in it). I would prefer just one stroller but if its better we could push two. What do you suggest? What's the likelihood that all 3 kids will nap at the same time?Thanks in advance.