If you want to help with the work of building Big Marsh Park (mountain bike park and nature area), come out this Saturday 3/19 from 9 am to noon. Here's where you find it - enter from Stony Island. You can reach this section of Stony Island from Doty (west side of Lake Calumet), 103rd or 122nd.
Hiking boots, work boots, or sturdy shoes you don't mind getting mud on are a good idea. If you have work gloves you like, bring 'em, otherwise gloves will be available for use.