What’s the difference between the four bear photo tours?

All four are in Katmai National Park. None involve backpacking. Bugs possible but generally manageable.

Brown Bears & Coastal Wildlife: Boat-based. Stay aboard a 100′ yacht, go ashore daily. Multiple bays, plus seals, otters, eagles. Minimal hiking, all fitness levels. Departs Kodiak.
Fat Bears in the Fall: Comfortable camping with Park Service infrastructure. Photography instruction emphasis. Bear portraits, cubs, pre-hibernation feeding. Minimal hiking. Departs King Salmon.
Brown Bears of Summer: Primitive camping, interior Katmai. Active salmon chasing in creeks. More human traffic than Mist trip. Variable hiking. Departs King Salmon.
Grizzlies in the Mist: Primitive camping, remote coast. Volcanic backdrops, tidal flats, very few people. Can be cold and wet. Easy to moderate hiking. Departs Homer.

Full comparison guide between these bear tours can be found here →