I've been to a few PGA events some of which are no longer around. All of them were enjoyable, but I think most were pretty standard experiences, so I don't think they're worth recommending over others.
On my bucket list of events is:
The Waste Management Open - I think it'd be fun to sit on #16 and be part of the rowdy crowd. It just looks like a good time.
Ryder Cup - Missed out on two opportunities to attend. Will be there in 2016 though.
WGC - Matchplay Championship - I like this format, it's one of my favorite tournaments of the year. Plus it's always interesting to watch the matchups and how they manage the course.
Any of the majors - For obvious reasons.
Also I'd like to attend some of the other team events. While there are fewer golfers, there's just a different atmosphere around those tournaments as everyone is cheering for the same team and against the same team.