I don't even golf, although on the few occasions I have I do enjoy it. Just takes up so much time, and really not much exercise there.
But I choose the Masters. Firstly, watching any professional sport is cool, if you have the time. Following the masters for 4 days, on what I understand is a gorgeous course, I mean that would be fun. Watching a triathlon, man, that is almost as hard as racing a triathlon and it is bam you see them bam you don't see them. Then you get to play the course, that has to be awesome....I mean I would need a butt load of balls but that is besides the point.
Doing Kona, it is an IM. It is torture and self fulfillment and you have the added bonus of "racing" with the best. Of course I would only see them once on the bike course and maybe once on the run course. I can get torture and self fulfillment in a number of different ways.