You definitely deserve a nice vacation!
I have to believe your kids will notice that you're not yourself post-op. And if you try to do everything to pretend you're okay for their sake, you'll probably end up delaying your recovery (sleep, and lots of it, is the best thing you can do to heal the first couple of weeks). There's lots of ways of presenting the information so that it's not scary for them.
Let me know if I can do anything to help!