Are you an experienced hiker and backpacker with a desire to help preserve native Hawaiian ecosystems?  You can be a National Park Service volunteer on the Friends of Haleakalā National Park strenuous 2-night service trip in Haleakala Crater, Saturday to Monday February 15 to 17.   Participants will stay in the Palikū Patrol Cabin. The work may involve removing invasive species and native plant seed collection. Park entrance is free, cost of 2 evening meals shared. Tools and safety equipment supplied by the park. For details and how to sign up, visit www.fhnp.org. Then email the leader, matt@fhnp.org .