Here are a few suggestions for an RV trip in states surrounding Michigan:

Wisconsin: Explore the scenic routes along Lake Michigan, visit the Door County Peninsula or the Milwaukee Art Museum.

Illinois: Discover the beauty of Starved Rock State Park or see the sights of the city of Chicago.

Indiana: Visit the famous Indianapolis Motor Speedway, or take a stroll through the Indianapolis Zoo.

Ohio: Enjoy the scenic views at Hocking Hills State Park or visit the Rock and Roll Hall of Fame in Cleveland.

Minnesota: Explore the Boundary Waters Canoe Area Wilderness or visit the famous Mall of America in Minneapolis.

*$500 is a budget constraint for a group of 5 people going on an RV trip, so if you you want to keep costs low, you should could consider camping at free or low-cost campsites, cooking your own meals, and planning activities that don't require a lot of expenses. you could also split the cost of the RV rental and other expenses among the group to keep the overall cost low. However, it's important to note that the cost of living and travel expenses can vary greatly depending on the location, so the $500 budget may or may not be sufficient for all expenses.