Need ability to remove shipping page - urgent

I sell Kayak tours, surfing lessons, and paddleboard rentals on my website. I setup marketpress, hooked it up to authorize.net, and everything works. Only problem is that our product (Tours and Rentals) do NOT require shipping. We have been using Authorize.net for many years and always enter a billing address, but not a shipping address.

Is there ANY way to remove the shipping page?

PLEASE HELP!

Site: http://newsite.lavidalaguna.com

Thank you!!!