Here's a link
to a list of free trout fishing spots along the lower Guadalupe. Rio Raft is free for the 1st 10 people per day. I have not fished it yet, but it is in the trophy trout zone, so may be worth it if you want to catch a big one.
"...only they weren't dogs, they were coyotes. They were curious about what he might be doing standing in a river waving a stick." Jim Harrison, from his novel Farmer