NEED HELP WITH SFGADV TRIP PLEASE

ok so i planned a sfgadv trip with my friends, we live in ny and decided to take rail from penn station because the bus departure was too early, i checked on the njtransit site and the rail from penn station informs me that princeton junction is the sfgadv stop, this is the problem i have no way of getting from princeton junction to gadv, i need to know if theres walking distince or are there cabs and the cost of one to go to sfgadv if anyone can help before sunday which is when i planned the trip that would be great