I love walking and bike-riding in the fall, whether in the city or the country. The cooler temperatures make me feel much more energetic than in summer.
What I love most about fall is that I get to wear what I want as it isn't too hot or cold. I can pick and choose what I find comfortable which we don't always have the ability to do in the winter or summer.
Fall is a party time: many birthday for my family members in between September to November. Mine as well...
The best part of fall in Atlantic Canada is that I can enjoy time in the hammock without being eaten alive by mosquitoes!