MINNEAPOLIS (AP) - Minnesota is making a big change in the reservation system for its popular state parks.

About one-third of state park campsites used to be kept out of the reservation system so that they could be rented by walk-up visitors on a first-come, first-served basis. But the Department of Natural Resources says they will now make all campsites reservable.

The agency touted the move on Friday as one of a series of moves focused on improving customer service. They have tested the change already in about a quarter of state parks and say the response was positive. They say it offers convenience and certainty to customers.

The reservation change will be rolled out in early May.