East Bay Regional Parks District got a corporate sponsor (Kaiser Pemanente put their “thrive” money where their mouth was) to pay the freight for free T-shirts and other goodies for those who sign up for the annual Trails Challenge. The pitch:

Thousands of people like you have participated over the 14 years-over two thousand last year alone! Register to receive the 2008 Guidebook filled with 20 of the best hikes in the Regional Parks. Trails Challenge invites you to hike 5 of the 20 trails or 26.2 miles of trails listed in the booklet by December 1. Participants will receive the Trails Challenge guidebook, T-shirt, and a special gift. A commemorative pin will be sent after participants have completed the ‘Challenge.’ Kaiser Permanente is a major sponsor of this program, enabling us to offer the materials free for this special 15th Anniversary. (one packet per person while supplies last) Reg. Required: 1-888-EBPARKS (1-888-327-2757).

Note you have to call to sign up. Packets are supposed to go out by the end of April.