We have workamped for the last 7 years. We hosted campgrounds just to get out of Texas in the summers. The pay was sickly, so we started volunteering for our campsite. We were able to choose where we wanted to summer.
www.volunteer.gov is a site that has COE, state parks, BLM, NFs and others. Some pay a stipend, which is about what we were paid for hosting a small FS campground. We have just picked where we wanted to spend the summer and e-mailed that National Forest to inquire about working/volunteering. Either they would direct us to an application, or to the contractor that managed their campgrounds. We have workamped in CO, WY, OR, and WA. Some of the state parks, like in WA and OR, only require a one month commitment. You could volunteer in different parts of the state and see most of it in one season. We took off this summer due to my Dad's death, but hope to get back at it soon....maybe even full-time for a while.