I made a short trip to Yellowstone National Park and vicinity a few weeks ago. I'd always wanted to see the park, and it didn't disappoint. The weather cooperated, too; no rain and mostly around 80 by the afternoon every day.
The geological features were amazing, and we had good luck viewing animals as well. I've never managed to see the bison on Catalina Island, but we had lots of excellent, close views of them in Yellowstone. We also saw elk, two grizzlies, and a glimpse of a wolf.