Transfers from Innsbruck to Santa Christina

We're off to Santa Christina at the end of Jan, flying into Innsbruck. I've looked at Terravsion but their daily transfer times don't tie in with our flights. I've resorted to hiring a car for less than £300 (8 days) but realise it will probably sit in the garage at the apartments for the week. Has anyone any recommendations either for affordable transfers or how we might make good use of the car?