Our grandson is playing baseball at the end of March in St George. Everyone is staying at the Temple View campground. We are looking for a stop off point between Boise and St George. Something easy...
Willard Bay is very nice, we stay there spring and fall. In Provo you can use Utah Lake State Park. Also use it in the spring and fall. It's about 1-1 1/2 hours south of Willard bay. At the end of this month you should not have a problem getting a site at either one of them.