Lake Michigan has the absolute best sand in the world. Don't go when the waves are too high and get out if you feel any tugs at your ankles that want to pull you away from land. But definitely go if you haven't, when the waves are a couple feet high it's a blast to just stand and let them knock you around. But make sure you wear a one piece or have a top that wants to stay on. If you go where you have to climb down some dunes to get to the water, make sure you're up to climbing back up. That sand can get HOT and climbing can be hard.