A documentary by Ron Mann. Featuring Woody Harrelson, Steve Clark, Michael Franti, and Ken Kesey. Rating unavailable.

If spirulina, worm-farming, and bio-diesel fuel all sound totally off the map to your ears, either Go Further is not a movie for you or you need it a lot worse than a Big Mac and another trip to Future Shop.

This latest documentary feature from Ron Mann ( The Twist , Comic Book Confidential ) is a lighthearted screed against overconsumption and heedless--or is that headless?--citizenship in general. It takes the pleasingly mobile form of a leisurely bicycle trip down the American West Coast, following vegan activist and hemp-made man Woody Harrelson from Seattle to Los Angeles. The former Cheers star, who also narrated Mann's last film, Grass , has a series of speaking engagements at universities and community colleges, where the somewhat spacy-seeming actor comes articulately alive on the podium. We also see him hanging out with various rednecks, local kids, and, in a too-brief segment, Ken Kesey, shortly before the original Merry Prankster died.

The film doesn't always rest on Harrelson. In the early, somewhat disorganized-looking scenes, Mann's camera spends much more time with Steve Clark, a Snickers-eating, ciggy-smoking good ol' boy who gradually comes to see the light about what he's putting into his body. Clark, who is among others on the bus following the cyclists, is a fairly obnoxious presence, but as he gains the zeal of a convert, he becomes steadily more amusing. And there's a nice human-interest diversion provided by his attempts to woo a young Englishwoman who joins the crew when they stop in San Francisco. (The degree of his success is pretty much left up to the viewer to determine.)

Along the way, there are also animated bits and brief, inserted musical performances with such as Michael Franti, Natalie Merchant, String Cheese Incident (who pop up unannounced and uncredited), and, over the end credits, Dave Matthews. The other side might have Ronald McDonald and the best damn lobbyists money can buy, but reactionaries rarely write songs you can hum along with.