1. Look online for the cheapest resale prices you can find for that resort, print them out and bring them with you. If you show them to the rep, say that you think the resale price is outrageous

and you're sure they will have to wait YEARS before they'd ever get that much money back!
2. Ask what time the rep has on their watch, when you first sit down together. Mention that you have an appointment (in 100 minutes or whatever) to meet others at a theme park (they don't need to know it's Goofy) and you DON'T want to be late. Smile, of course.
3. Start the meeting with negative comments about anything you found unsatisfactory about the place, if there were any. Mention that the location is not your very first choice.
4. Mention at the outset that you never, ever, EVER buy anything that costs more than $200 without talking it over, OVERNIGHT, so there WILL BE NO SALE THAT DAY as an FYI. Smile.
5. If they say that you'd only be able to return to their wonderful resort by buying, say that you like trying a new place in Orlando with each trip.
6. Unless it's something you want to say, for a purpose, don't make small talk. They ask a lot of open-ended questions so that they can try and gear the sales pitch to hook you. The less they know about you, the better. (Ex., they ask, "What kind of work do you do?" "That's personal"

then look away.)
7. If (um, when) they ask what kind of vacation you like, say "relaxing, no pressure." You might even say (if it's true) that sometimes you just prefer camping in the back woods.
8. Prep your children... no "oooh, ahhh" if they see a big screen TV, a double jacuzzi tub, the main pool area or the playground. Let them know this is ONE time when you WILL permit them to tell you that they are bored or want to leave, right in the middle of an adult conversation.
9. Guard your own expressions (neutral) when you tour... don't nudge your spouse or smile or wink when you see something you like. No "oooh, ahhh" from the grown-ups either.

Just wait until you are away from the rep. When asked, "What do you think of the resort/rooms?" ...answer, "they're like you'd expect, this area seems to have a lot of very nice resorts."
10. Don't tell them you would ever want to exchange outside of Orlando. They will waste time lying to you about where you could "easily" trade "whenever you want." Why would anyone want to go anywhere but Orlando!?!?!!
11. Mention the great local deals at suite hotels and how interesting it will be to see if rate bargains stay steady for a few years if there's a recession.
12. IF they keep pressing the sales pitch after you have said no and AFTER your tour time commitment has been met, tell them that you appreciate their time in showing you around but your decision has been MADE and you don't want anyone to waste any more of their precious time. If that doesn't work, smile and tell them that they have seen your gentle "no" but they really won't want all the other nearby touring guests to hear your frustrated, emphatic "no," do they?
12. Last but not least (and again, if your time commitment HAS been met), if they persist, remind them of the time on their watch, say no thanks (as you please) and just get up and leave.

Once you've toured, you've fulfilled your end of the deal. Adios!
BTW, most of these techniques are rarely necessary.

The tours can actually be pleasant if you are able to sense that the salesperson understands that you are just fulfilling the obligatory tour but will not be buying, period. Sometimes the afternoon tours are less pressured (the reps may be more tired) but they blow your whole day.
For the person touring Grande Vista, Marriott is known for rather LOW pressure tours, with a lot of good information sharing.

Hope this helps.
