Island Park to Old Faithful is a 39.5 mile lightly trafficked point-to-point trail located near Island Park, Idaho that features a lake and is rated as difficult. The trail offers a number of activity options and is best used from June until September.
Use GPS. The trail wasn't obvious. Even when you hit Summit lake trail it's still a little spotty. I took a bear bell and bear spray. Unfortunately I didn't run into any animals. The only place for water is Summit lake. The stream coming out was dried up.