Resting around the pool all day, reading, doing nothing? My god, I have not done that in ten years, and I have missed it. I have little kids though, so I won't be for another ten years.
I agree, a slow way back from vacation is the best way. Especially if you are leaving a drastically different culture and transitioning to a more similar one. Or maybe that is only good for people that are not very adventurous, like me :)