The Key West Southernmost Runners' 26th annual Earth Day 5k Run/Walk takes place Saturday at Truman Waterfront Park at the end of Southard St. The start and finish line is near the U.S .Coast Guard Cutter Ingham Maritime Museum. Proceeds from the race benefit the Conch Republic Marine Army, a local non-profit grassroots organization dedicated to cleaning and restoring the shallow mangrove habitats of the Florida Keys. Registration is $25 per person (free for children under 5 with a parent). Participants can register online or in person at the race location from 5 to 7 p.m. April 19, and at 7 a.m. April 20 before the 8 a.m. race start.