Leaf art: Check out this book from the library for fun ideas.
Go hiking before it gets cold: Some ideas from Washington Trails Association.
Visit the Arboretum.
Host a pumpkin carving party.
Go to a corn maze.
Listen to some ghost stories.
Have a picnic at a park.
Halloween at the Woodland Park Zoo.
Bonfire with marshmallows.
Go to a school sporting event.
Drink or make apple cider.
Volunteer/donate to a food bank.
Rollerblade around Greenlake.
Take a picture of a colorful tree & send it to a friend.
Decorate your locker for fall.
Send something to a sibling or friend at college.
Run the Green Lake Gobble.
For a comprehensive list of events, festivals, etc. check out: