The Taconic Marathon Bus will go directly to Staten Island non-stop. 
TRR members $30, everyone else $40.
The Taconic bus will leave PROMPTLY at 5:30 AM from Downing Park.  Runners will be dropped off in Staten Island at McLean Avenue and Lily Pond Road, about a 10 minute walk to the entrance to Fort Wadsworth.
The bus will not be in Manhattan after the race, so you will need to find transportation to get home.