These are some ideas I found on the book of Samhain by Llewellyn.
Besides the usual trick-or-treating and pumpkin-carving 
try these:
Adopt an Ancestor
Go to a cemetery with a friend or two, or with your children, and look closely at the neglected gravesites. If it feels right to you, tend to that grave. Clean off any leaves or debris, call in any vandalism you happen to see to the cemetery keepers, and when done give a small offering of water to the soil of the grave. Before you leave, pause to address a prayer to the gods or the land, asking that this soul be restful and the grave be honored.
Make a Parshell
A parshell is a type of cross intended to protect children from mean-spirited faeries. While it came to be associated with the Christian cross, it predates its presence in Europe. It really works as more of an X type cross—a figure that can often stop outside magick in its tracks or seal magick of your own.
Apple Bobbing 
The United States and the United Kingdom had apple bobbing (also called apple ducking) as a common Hallowe’en game, where children attempted to remove apples from a tub of water with only their teeth.