I do agree with "Put One's Money Where One's Mouth Is." I also believe in doing more than just writing a check. I believe in volunteering and working too. For free. 

You put it a wee bit snarkily however be advised every year  I buy fishing licenses and Parks Passes, and more! I have for 24 years now. CO Parks & Wildlife (CPW) I do my best to support (among other diversified organizations.) 

Trout Unlimited is a new one for me so thank you for that. 

PS Thus far, contacting Forestry, or BLM or Open Space protected area officials has worked in clean up re items I cannot pack out. And as one person mentioned below, the Youth Conservation Corp also does trash clean up as well as trail and facility amenity repairs.