While I do not know of anyone specific,you can take public transpo all the way from the SeaTac airport to just a few miles outside of the park if I'm not mistaken.From Seatac you would hoop on the Metro bus all the way to Federal Way transfer station,then you switch to Pierce Transit system.You can check online for the route info. There might be a route that eliminates the transfer but it has been quite a few years since I lived there. This might help you,with less to travel,it might be easier to get a ride.