My son is also turning 4 and we came up with a few ideas.
1. S-pin the web on spidey
2 packs spiderman wall clings use the web to stick as close to spidermans hand as possible. you can use one of the spideman masks taped on the eyes for a blindfold
2 Spiderweb ball toss
I found really cool foam balls at the dollar tree that are spiderman, use red and blue buckets and number them. set out in a row and have them toss as far as they can into the bucket. each number gets a certain prize
3 (outdoor) Best spiderweb contest
set up big cardboard pieces or you can use plywood(what we did) have the children spray on a web with silly string.
of coarse you can get all the decorations and stuff at most any party store or walmart. Good luck hope yous is a success. ... View related article.