Get outdoors this weekend and help with forest restoration for the Martin Luther King Jr. Day of Service. Options include helping EarthCorps, a community-based environmental-restoration organization, remove invasive plants, weed and plant native trees and shrubs, 10 a.m.-2 p.m. Monday at Cheasty Greenspace, Cheasty Boulevard South and South Della Street, Seattle; preregister at www.earthcorps.org.

Or pitch in on a Washington Conservation Corps project for all ages to remove invasive plants to restore forest habitat. Wear sturdy shoes or boots and bring work gloves, if you have them, 10 a.m. Monday, Carillon Woods Park, 5429 106th Ave. N.E., Kirkland. Preregistration requested, but not required: www.kirklandwa.gov/depart/parks/Green_Kirkland_Partnership.htm.

Also, in celebration of the Martin Luther King Jr. holiday, admission is free at all Washington state parks that usually require the Discover Pass and at Mount Rainier, Olympic and other national parks, Monday; see www.parks.wa.gov/events and www.nps.gov/findapark/feefreeparks.htm for more information.