Iao Valley State Monument will be the fourth state park in Hawaii to require advance reservations for visits from nonresidents, as soon as it reopens after a slope stabilization project.

The reservations are meant to limit the number of visitors at Iao Valley throughout the day, with 30% of parking spaces held open for state residents, who can visit at will. Out-of-state visitors must also pay a $5 admission and $10 parking fee — both free for state residents.

Meanwhile, Iao Valley’s reopening date is still in limbo: On April 11, the state announced it’s been postponed “until further notice.”