I guess it would depend somewhat on your local climate...but mulching and composting are definitely on my to-do list this time of year. Also cutting back annual vines, removing depleted/dead vegetables plants and generally tidying up before winter hits for real. Also removing perennials from the containers and moving some of them to the shed. My vegetable garden is mostly cut back now, except for some very hardy greens, and the asparagus bed which I won't touch until the ferns are completely brown.
I'm waiting for my giant maple tree to do its humungous leaf dump on the front lawn and driveway, then I'll be raking up a whole bunch of leaves. Some will go in my compost pile, the rest bagged up for the township to take away. And if it counts, cleaning the leaves out of my gutters after the final leaf dump too.