No, we'd never go into debt for a vacation...or any other reason for that matter.
We have a household budget. Each year we set out our goals for the year. We're actually sitting down together next week to lay out our yearly plan.
First, we set our savings goal. I don't imagine we'll go up as we already save 60% of our net income. All of our long-term savings is for retirement. We have no other long term plans such as a vacation home or anything like that.
After the savings percentage is set, we look at and revise our monthly budget. These are "the bills". We have no debt at all (not even on the house), and so for us, this is all of our insurance costs (auto, home, life, disability and the amount deducted from DH's employer for health), utilities (gas, electric, water, cable). DH's employer pays for the house phone and internet. Also included in "monthly costs" are groceries, pet expenses for our dog, and "spending money".
Once that amount is totaled up, we deduct that total amount for the remaining 40% of our net income that we don't save.
The remaining percentage is for larger expenditures we'd like to make, such as a big project around the house, giving that we'd like to do and vacations. Usually, we end up budgeting $1,000 per month towards vacations. Some years we use it all, some we don't. This year we didn't use it all so we used the remaining amount to purchase a used car for a relative in need.
So, we budget for vacations.....always have the cash in hand before a single thing is booked.