I remember going to a neighbor's party a few years ago and this came up between a retired megacorp VP, a Washington lobbyist, and perhaps someone else well-to-do. They all took high end cruises and guided tours, probably not flying in coach, staying in nice hotels, and going in prime season. They concluded that $1000/day for the two of them, or $500/person/day, was about their average.
I know I'm well under that, but it depends on where I go. A ski trip is going to add nearly $100/day just with the lift ticket, plus ski lodging isn't all that cheap. For other outdoor trips I may have no extra costs over food and lodging that maybe park admission. It's so varied I'm not even going to try to answer, and it's pretty useless information unless you take the same kind of trips I do, or my neighbors do.
These are the kind of polls I shake my head at. What possible useful information are you going to get when you don't know if my vacation is driving in the woods to tent camp, or flying to NY and staying in a nice Manhattan hotel with fine dining and see shows? For my neighbors, they knew they took similar vacations and probably just wanted to see if they were missing something and spending too much. They didn't even bother asking me because they knew I didn't travel like them.