and you'll have pool for kids, close access to food options and some fun activities if you need a day of not driving. Floating the river from Big Springs down to the hotel is a fun, slow, lazy way to spend a chunk of a day, see incredible scenery and let the kids get wet on a hot day. You didn't mention how long you're going to be around, but if it's more than a day, your kids are going to get tired of driving and you're going to get tired of fighting tour buses for parking and a day in the forest will really help.
I've made a lot of trips up that way with kids over the years and they tire of Yellowstone quickly. You'll probably want to see more, but they'll be ready for a change quickly. Break up the driving with something else.
BM if you have questions. I was up in Island Park last week and live not too far away.