August 1998 for a friend's wedding. Had no idea what we were doing - stayed at a Best Western way off strip, did no gambling (had two young sons with us) and the only buffet we ate at was Circus Circus.
So I count my first "real" trip as October 2001 to celebrate my 40th birthday. We've managed to get there every year since (this year's trip late November/early December)
What I Like Most About Las Vegas Is...
Visiting Vegas is like taking time off from the real world.