New, completely revised and updated edition of best-selling award-winning guide! Reviewers enthused: "An excellent resource guide!"
"A money-saving guide to hundreds of retreat and ecological tours".
"Wonderful vacation possibilities, plus comments from people who have taken them!"
Stay Free in magnificent national parks if you volunteer to welcome campground visitors, clear trails, lead nature walks, document ancient rock art, or scuba dive into extinct volcanoes.
Plus discover low-cost adventure vacations where you hunt for diamonds in Arkansas, dig for dinosaurs in Colorado, sail a schooner in Maine, or bike beneath California redwoods. This book provides complete up-to-date details of names, addresses, phone and fax numbers, what's available and who to contact.
