Yuba Lake and treasure hunting!
There are many gorgeous camping spots here in Utah, you'd have no problem camp-hoping around!
Besides fishing, boating, sailing, you can visit The Little Saraha Sand Dunes Recreation Area as well as the Pony Express National Historic Trail. This, I think would interest the kids: like hunting for shells, you can find semi-precious stones on Topaz Mountains and then go for a ride through Loop National Scenic Byway.
At Topaz Mountain: I'm interested in taking my family there, because imagine all the treasures you could find? Check this site out for one persons's findings.
Location: just east of I-15, about 110 miles south of Salt Lake City
Have you ever gone treasure hunting?