The Michigan Department of Natural Resources says campground reservations are up 12 percent over last year, a positive trend for Michigan's economy.

Ron Olson, chief of the DNR Parks and Recreation Division, said the year-to-year camping reservation increase is a healthy start to the summer season and also a positive indicator for Michigan’s tourism, generally.

Currently, the DNR has 645,000 camping and lodging nights booked through this season, up nearly 67,000 from last year at this same time. It is anticipated there will be more than 1 million camping and lodging night reservations by the end of the 2016 season.

Many state parks and recreation areas have availability throughout the summer, including Memorial Day weekend.

Camping reservations can be booked up to six months in advance in state parks.

A Recreation Passport is required for vehicle entry to state parks and recreation areas.