Apple picking, apple concocting (pie, crisp, sauce, cider), learning about Johnny Appleseed, apple poems, a few apple books and videos, and even the discovery of the law of gravity based on a falling apple. (Should I clarify? We didn't actually discover gravity, that was already done by someone else.) :)
We tried our hands at watercolor paintings. That was fun. (The step by step lesson can be found here.)
If you want to play along, or bookmark some resources for next autumn even, here they are: our local library has this apple farming video and this gravity one, this Johnny Appleseed book we enjoyed, Apple Farmer Annie, and of course, Ten Apples Up On Top by Dr. Seuss, and about 3 dozen more, if you think to request them from the library sooner than I. :) For our poetry, we liked printing out this template, and the younger ones used this and this for their handwriting lessons. Here's some chemistry we haven't got to yet, but it looks fun. If you happen to plan ahead by more than 5 minutes (like me), there are a ton of activities and lessons to be found.
Coming soon: our Apple Party!