Bobbing for apples is still good, even for adults. Also, my parents would play a game where two teams, lined up boy/girl/boy/girl would pass an orange (or a grapefruit) down the line using only their necks/chins... it gets pretty funny.
For any kind of punch you decide on, one thing you can do is fill some surgical gloves with water and put in some plastic spiders and other bugs.. and then freeze them. When they're solid, peel off the glove and use the buggy ice hand in the punch bowl.
If you need some food ideas, how about these two?
Frightful Finger Food (makes about 5 dozen)
1 cup butter, softened
1 cup icing sugar (powdered, or confectioner's, sugar)
1 ts almond extract
1 ts vanilla
2 3/4 cups all purpose flour
1 ts baking powder
1 ts salt
3/4 cup whole blanched almonds
1 tube red decorator gel
Mix together butter, sugar, egg, almond extract and vanilla. Then, beat in the flour, baking powder and salt. Cover and refrigerate mixture for 30 minutes. Working with one-quarter of the dough at a time (the remaining dough should stay refrigerated), roll heaping teaspoons full of dough into finger shape for each cookie. Press almond firmly into one end for nail. Squeeze in center to create knuckle shape. Using a knife, make slashes to create knuckles.
Place on lightly greased cookie sheet in 325° oven for 20-25 minutes or until pale golden. Let finger cookies cool for three minutes. Lift up almond and squeeze red decorator gel onto nail bed and press almond back in place so gel oozes out from underneath. Repeat with remaining dough.
Igor's Bloodshot Eyeballs
4 packages Philly cream cheese
2 jars small green olives stuffed w/pimentos
Red liquid food coloring
1 loaf of pumpernickel bread (or cocktail bread slices)
Make each eyeball with one tablespoon of cream cheese. Then insert a green olive, pimento side up, into the ball. Press firmly so it causes the cheese to crack around olive. Then dip a toothpick into red food coloring and let a drop fall into cracks of the cream cheese. Allow the food coloring to spread so that it creates 'blood vessels.' Serve Igor's bloodshot eyeballs on a bed of crumbled dark bread, or individually on slices of cocktail bread.