Summer in the Treasure ValleySummer in the Treasure Valley means lots and lots of activities. There are so many fun things to do in the Treasure Valley during summer which is why it's one of the best seasons to be in Idaho. Whether you are just wanting to go down to the river or go out and do something with friends and family there are plenty of fun things to consider. Treasure Valley TopgolfOne of the most loved activities here in the Treasure Valley is Topgolf. Topgolf is widely loved here in Idaho and especially considering it is somewhat new people are constantly looking for an excuse to go.