We did this years ago for Busch Gardens tix, and while it took about 2 hours we actually had fun making them squirm a bit.
DH and I are both accountants, and both know the importance surrounding contracts and contract laws. DH also has experience in investments, and having lived in a community governed by an association agreement we also knew that these timeshare communities are also governed by certain agreements.
We let them go through their spiel, and as they encouraged us to buy we started asking our questions:
1) Please provide us with documentation on RCI and written information on the exchange procedures and fees.
2) Please provide us with a copy of the offering statement
3) Please provide us with a copy of the purchase agreement so we can review the terms and conditions with our attorney (they told us they could send us to a local attorney, but we informed them we had a real estate attorney in our home state who would better represent our interests)
Within five minutes of asking for those items, we were thanked for our time, handed our tickets and on our way.
We scheduled the visit on a rainy day, so we didn't miss any real 'fun' time doing it and saved over $100 on the tickets.