That's a tough call. $4000 is a boat load of cash. I was looking at it but decided no since it's not worth it for me; I already have experience. I would call them and make sure you're getting something in the end. CMEs don't really matter right now. If you're an EMT it looks like you'll get WEMT upgrade.
But if you're just going to be out there for a month practicing splinting, roasting marshmallows, and listening to someone talk about hypothermia, I would save my money, buy some good wilderness medicine books and go camping.
It may be better after you're a doc and can become a fellow in the wilderness medicine community.
Heck I could think of a lot more to do with $4000
http://northfield.org/node/1851
for instance...
Let me know if you need other ideas - high speed driving school, parachuting, trip to costa rico, trip to europe, 0-G plane ride...