Not that I know of, but when the opportunity to take a free vacation presents itself, I always click No. It works just as good! Try it!
It really is not "just as good". I rarely read the oppurunities when they pop up and often end up clicking Yes out of habit from playing the Sims 3 for 2 years without this horrible horrible vacations. There is no way to cancel the vacation once is started so I'm screwed waiting for sims to return. I end up loosing all my saved wishes & on at least 1 sims I completely lost all their progress on Lifetime wish.
If any modders happen to read this I'd really appreciate it. Sure others would as well.