I'm often guilty of this. Usually it is because of tight time restraints on our end. But after careful introspection - even while on vacation I pretty much tackle it like work. Truth is I just don't know how to relax. I guess I feel like I have to be busy every minute.
When I'm at home I take little breaks to read or check my email, but I'm very high strung while on vacation.
I think I need vacation therapy. And practice - 'til I can balance it with relaxation and activities. I wish that was covered by my health insurance. Hey, a girl can dream!