I love timesharing but after living in Wyoming and spending a lot of time in the Park, I am not convinced that staying at the Worldmark Resort would be the best use of time/money. Average speed in the Park is 35 miles per hour on curvy roads... if animals are in/near the roads, traffic comes to a complete standstill as people take it all in. How long traffic comes to a standstill is completely dependent on the animals. Additionally, the only time they can fix the roads is in the summer. Work is performed around-the-clock to make use of the limited season they have for repair. Even though a 35 mile drive should take an hour, expect 2hrs + between animals, lane closures, and traffic. This is especially true in July/August where visitor numbers rise, and in June, when snow is still a factor.
The drive to Old Faithful would be your easiest trip from the resort... as you want to go explore different geysers, hikes, and fishing spots, the drive becomes increasingly long. In season, making the loop becomes an all-day endeavor. I'm not trying to dissuade you from using the resort per se, I just want you to go in understanding what it means to be going to a spot 80 miles away from the resort for a hike - expect it to take a minimum of 3 hours to get there and another 3 hours to get back to the resort and plan your hike accordingly.
While you are there, you may also want to take in the Grand Tetons and the 52 mile road into Cody, WY. There were times when I would see more animals along this stretch of road than in the Park. Bison and Big Horn Sheep so close you could roll down your window and touch their rumps - it really was amazing.
When you go... please also head the bear warnings. We have bears in Colorado but the ones up there are really cranky all the time!
