The answer, boringly, is that it depends. It depends on your situation. Are the deadlines from work that you are tracking on your vacation? Then you better have your calendar, at the least, with you.
I don't take many vacations. When I do take them I try to disconnect from work as much as possible. But if there is a major milestone occuring in the midst of a major project, I will stay in touch with the office.
I use a PDA and I take it on my vacation. O don't do a weekly review. I keep it mostly for the addresses and phone numbers.