Place to stage from in Rexburg (quick look at hotels in the area shows super high prices) for one or two days of day trips.
A friend says there's one way to go where yu get a bit more wildlife and then the other where you'll see more people but get to the geyser.
What say ye?
Family of 6, 4 kids (8, 6, 2, 6 months). They hike fairly well.