Probably no amount.
We aren't crazy wealthy, but we have enough equity in a high value real estate market that if we sold our house and moved to many places I'm the world we could live well without being required to work. As a result we have asked ourselves many times: "where would we go and what would we do?" And don't have a better place then we are (near both our families) or our current jobs. Our kids are in school, so traveling is limited, since we don't want to make home schooling our job.
The only thing I wish we could afford is first class airfare when we do fly once a year or so, but I wouldn't call that life changing.