went last friday night, not bad turn out however I wished I could of stayed later in the night.
ended up catching a taxi there from Yokohama station and somehow managed to call a taxi to pick us up as well.
cost about $100 there and back ($50 each way)
I recommend staying at Yokohama overnight as last train that leaves to Tokyo is about midnight.
Otherwise the best method to get there will probably be to get an international licence from NRMA and hire a car to drive there, not too hard to get there.