I'd think that at a STAR, a short event would be well accepted. At STAR '97 in Lake Eufaula, OK, they did a Dam Tour. They had about 6 or so dams in the area, and the idea was to visit the dams during STAR. I don't know how many participated, and I don't recall now if they had any prizes or anything, but my buddy and I visited them. I thought it was kind of fun. Any theme could be chosen.
Along similar lines, but on a bigger scale, if it is done outside of a rally, there is the Grand Tour, where a number of checkpoints scattered around the area are chosen, and participants visit the checkpoints on their own schedule at any time while the event is open, usually for a season. I've organized several of these in Michigan, and had great feedback from those who have participated. Generally I'll have 50 or 60 people sign up, then only about 12 to 20 who actually do it. Many have signed up every year but never visited any of the checkpoints. The AMA lists several of these that I think cover much of the country, while mine have stayed within the state of Michigan.
As was stated earlier, it's not for everyone, and it's not mandatory. However, it's an option. Those who do participate have a good excuse to go for a ride and see things they wouldn't have thought to go see or do otherwise.