You want to leave a vacation legacy.
It does sound like a hackneyed phrase used by over-zealous timeshare salespersons, but the truth of the matter is that for most people, vacations are some of the most valuable time you spend with your family. I don't know about you, but I can't tell you what I received from my parents for my 18th birthday, but I can tell you every detail of the vacation we took that year.
And if I had children, that's something I would want them to experience as well. Leaving your heirs $20,000 in cash is a nice idea indeed. Which makes the greater gift...$20,000 in stuff that is designed to wear out, or a quality vacation that can be used and enjoyed and shared every year?