CORNWALL The Hudson Highlands Nature Museum will hold its fifth annual Hike-A-Thon on Saturday, April 30, starting at 9 a.m. Part of its Earth Day celebrations, the hike is one of the museum’s major fundraisers for the year. Earth Day activities will include a family fun fair, and a community yard sale. Hikers are asked to form teams and seek support from friends, family, co-workers and local businesses to help them meet fundraising goals. There’s no registration fee, but hikers are asked to try for a goal of raising $100 per hiker. The hike will be held rain or shine. To become a Hike-A-Thon sponsor or team leader, or to learn more about any of the museum’s Earth Day activities, visit www.hhnaturemuseum.org or call 534-5506, ext. 204.