Free: Contests & Raffles.
Make the whole event exciting. Kids have a very short attention span so move from one thing to the next. Point out tracks, cross a creek, spot a rub. Make it fun all day even if you don't see or hear a thing. Get excited if your son notices something that you are trying to teach him. First trip success will be him saying "I want to go again Dad".
Tag. How old is he?
North side of mineral lake has a pretty good road system not to steep walk in behind the gate get up top there are some nice cuts up there and some good reprod also saw a nice 4x4 come out of there two years ago. Plus it's a nice drive up there