might not need a golf cart the whole time. where are you staying?
the airfare can be arranged by you or her. she does it a lot....
just fly from the airport. boats are available, cheaper, and more of a hassle. at least your first time.
re groceries, there are several stores as you go south from town... big ones (island supermarket) and lil ones too.
check here for golf carts:
its nice to have Simon stock up the house with groceries also. see Lagniappe Provisioning