Mount Rainier National Park, Olympic National Park, Fort Vancouver National Historical Site, and Lewis & Clark National Historical park are all have free entry (along with all other National Parks) on Monday for MLK Day. So go outside! If you can't make it on Monday, National Parks will have free entry on the following dates in 2017: February 20: President’s Day April 15-16 and 22-23: Weekends of National Park Week August 25: National Park Service Birthday September 30: National Public Lands Day November 11-12: Veterans Day Weekend