Hiya - Here's what I know:<br><br>
-there are shuttle buses that run regularly to all main towns on the island if you're just going for the day they should be fine<br><br>
-odds are you wouldn't get your car over last minute anyway, you need reservations for vehicles and it would cost you more than $100 anyway, which isn't worth it for one day (IMHO). If you still want to try, the ferry out of Woods Hole is the one that takes cars to the Vineyard. There are other passenger-only ferries to the Vineyard that leave from other parts of the cape<br><br>
Hope that helps!