Mr. L., sorry, regarding my original answer, the handi is ~12.
As to Huck and Gill's idea of, if you are playing golf, you are having some version of fun, I can go along with that in the social, commeraderie sense. But, once you actually consider the act of playing golf rather than bonding for grins and giggles, I believe the apparent consensus here trends towards, contour, firm, strategic, not oppressively hard, nor unduly lengthy in time required to play (efficient balanced routing) nor distance in overall length of the course. Also, balance as to shots required of all the clubs in the bag.
But, our old friend Tim Weiman's oft quoted observation holds a great deal of value to me: "people want to play more, not pay more".
Frankly, I have felt that an otherwise "fun" round on a great course is ruined by the excessive freight charged by certain courses. For those that love to play often, and varied style course, prices sometimes don't factor into the first sizzle inclination to go try a new, heralded course. But, the fun factor diminishes rapidly for me when a certain "buyer's regret" sets in, usually causing me to say, "one and done", to an expensive course, that I realise was great, but just too costly to overcome the allure of a repeat play at outrageous prices, no matter if that course was otherwise, "fun".
I wonder if top level architects operate on a default notion that in order to create "fun" on a golf course, a certain element of extreme, bombastic, or expensively done landscape, waterscape, eyecandy features are a requirement? Thus, for every added excessive landscape feature added, the cost to the end user is increased; until the end result is a set of diminishing returns, with the fun factor overcome by "buyers regret", and a "one and done" result that disencourages the fun seeker to repeat play?