E-J,
Really sounds like a great trip and the October timing is ideal. Couple suggestions on wildlife. The experiences at the griz/wolf/elk “preserves” can be disappointing, as the wild character of these critters is absent and other visitors don’t always help the ambiance. Might as well visit a small zoo in PA before you leave home. If you want to see these animals in a wild setting, best bet by far is to spend more time in the Soda Butte/Lamar areas. When I have a serious visitor(s) who is keen to see a wild wolf or griz bear, we often travel this stretch two or three times, especially the wide Lamar vistas. Take a couple coffee breaks to give things a chance to change. A wolf pack can be just a couple feet out of sight. Others will likely spot your target animals first. Stop at every gathering and inquire. Most folks are happy to let you look through their spotting scopes. Over 40 years of mostly day trips to the park, we have seen almost everything “wild”you can imagine in this area. If the animal sightings are rare, you can always hit West Yellowstone.
Another tip is a drive across Turner’s ranch, a short trip (20 miles) SW of BozeAngeles. Roughly 20 square miles of private land (no hikes or picnics) with a good county gravel road across much of it. Drive in to the Spanish Creek trailhead (hike/picnic) and back out, less than 25 miles. Sometimes this drive has more wildlife than the Lamar. This ranch has regular visits from wolves and griz, and a large resident elk herd. Also over 3000 head in a large commercial herd of bison. These guys can be every bit as dangerous as their kinfolk in the park. Stay back from them.
I live just outside of Bozeman. A very nice town, and, as they say... “only 15 minutes from Montana.” Enjoy!