Any of them that we got paid as "mystery shoppers" hired by a company to do them. The best through that gig was our shopper fee, accommodations for three nights + meals and travel expenses (airline + ground). That was to shop a California company. We made a very nice mini-vacation out of that.
We also shopped a Hawaii resort (but with no airfare) but we did get to keep the $150 cash offered for the tour, plus the Shell discount card which saved us over $1,000 during our two week stay.
As for just the run of the mill, available to the public TS presentations . . . I'd have to say the $200 US greenbacks for the Palace Resorts' tour in Cancun. It was high pressure, but the $200 plus the discounts for the tours we booked through them, were very nice.