After he *misses* the football (Lucy yanks it away), pick up the football and go left to Snoopy's doghouse. Use the football and it will knock his helmet down from the tree.
Play the football scene with Lucy and Charlie Brown. Pick up the football and use it at the doghouse.
After Linus mails his letter, go left to where Lucy and Charlie Brown have the football.
Play the football scene with Lucy and Charlie Brown. Pick up the football and use it at the doghouse.
The tree is in Charlie Brown's back yard, right by Snoopy's dog house.
Lucy!
The name of the island is Great Pumpkin Island. See the related question below.
Charlie Brown is originally outside Linus and Lucy's house, and Lucy is inside. When you complete the pumpkin patch sequence, Charlie brown is with Snoopy in his backyard (left). When you finish collecting the leaves, and Linus jumps in them, follow him to mail his letter. After he does (with a delay to recover his blanket), Lucy and Charlie Brown are playing with the football in the yard.
Lucy. ...and then she pulls it away! Hahahahh :)
Take the pen that Linus was using in his house, and let Charlie Brown use it in the football scene. When Lucy and Charlie Brown leave, take the football to Snoopy's doghouse and use it to knock down the mask.
Pick up the football and go left to Snoopy at his doghouse. Use the football and it will knock the helmet from the tree, beginning the Flying Ace adventure.
Pick up the football and go left to Snoopy's doghouse. Use the football to knock the goggles out of the tree, beginning Snoopy's "Flying Ace" adventure.
you help snoopy when you get the football from charlie brown and lucy after they leave from the backyard. use the football to get snoopy's goggles from the tree near his doghouse. hope this helped!