I think it's almost universally accepted that you can turn your pager off while on vacation. As others have said, whether it's ok to do so at the end of the day is program and especially specialty-dependent.
Personally, in residency I would leave my pager on even when I'm at home. I didn't want someone paging me about something urgent and not knowing how to get in touch with he team, and once every other month or so I would get a page when I wasn't working, usually because the person paged me because I wrote the last note or placed an order or whatever. I would reply just to give them the contact info for the on call team--wouldn't place orders, wouldn't call myself, but at least made sure they knew who to call. Maybe they would have figured it out on their own but it really didn't take me more than 30 seconds to answer most of those pages.