a lot of the smaller streams have tons of little wild trout in them that are a blast to catch especially for a 10 year old. i have picked one on a map, find it and try it. maybe a tough proposition for a 10 year old if there are no fish there i guess. any of the forks of the teanaway, taneum creek, boxwood canyon creek, etc. the teanaway is always fun and you might be able to hike up into esmerelda basin a ways and find the stream and try it, i never have. i just always fish along the road. the further you get from the yak, the more cutthroats and less rainbows you'll fine. there is a book i bought at a flyfishing shop that is titled something along the lines of the apline lakes wilderness fishing guide. a lot of the hike in fishing you'll find is gonna be at lakes.