While there are a few ice cream shops, pizzerias, bars, and grills along the main streets in Lake Geneva, if you are willing to go over a few blocks from downtown you can try Simple Cafe. The best review I could give this place is that I ordered a burger from the menu thinking it was a regular beef patty with just a lot of vegetable toppings on it, only to discover it was actually just a veggie burger(duh). However, I still enjoyed it and was not too disappointed about my order confusion.
Overall Simple Cafe lives up to its name by serving a lot of vegetable friendly foods and focusing on healthy options. Right next door to Simple Cafe is Simple Bakery and Market, where they sell fresh bread, jams, snacks, baked goods, and some of the best sugar cookies I have ever had. It was a nice change in cuisine from some of the other main restaurants in Lake Geneva.