Shuttle Vans

Hello,
I looking to get shuttle vans to transport my guests from the Hilton Garden Inn of Ronkonkoma to St. Mary's Church in East Islip, then to the Bourne Mansion in Oakdale.
I would then need the vans to come back at the end of the night and bring them back to the hotel.
I am not sure of how many vans I need right now because I don't know how many people will be staying at the hotel. I will need at least one van and the most 2.
Any information/quotes will be great.
Thanks