That said, the trick is to make certain that you can make the payments on time so that you won't incur the finance charges (not really an issue here - that's more on appliances and furniture and such). And that such deals don't entice you into making purchases that you wouldn't have wanted to make without the deal.
Of course, that's why the parks offer them - to attract additional customers. If you really want this pass and can afford the payments, go ahead. If you're not sure you want it - don't buy it. Save your cash for something else you need, or want more.