I assume you are talking about hitching from Fosters Bar to Graves Creek on the Eden Valley Route 3348. This is only 40 miles but will take 2 hours. I have used the shuttle and it is not a bad deal. There is a fair amount of rafter traffic on weekends but hitch hiking might be hit or miss to Graves Creek. I have rafted and hiked this section and it is worth the effort. Allow yourself time to explore the historical sites and bring extra $ for stops at the lodges. A fair amount of poison oak in sections but the trail is well maintained. The lower section has problems with bears but just avoid the boater sites. If you have questions feel free to PM.