I find the 70-200 to be too big for a vacation lens. It may also attract unwanted attention in a country where the price of that lens is a signficant amount of money (probably someone's annual income!). If it's for vacation, I'm taking an old 75-300/f4-5.6 if I really need a telephoto lens.
If I was on vacation, I'd advise leaving the grip home. The one thing you are missing is a wide angle. On vacation, i find that most pictures are taken with wide-medium focal lengths, especially on the crop factor camera.
Of course, if you're planning on doing a lot of beach observing....
