Treasure hunt - get two simple jigsaws with the same number of pieces (about 24 for seven year olds). Mark the backs of one jigsaw with red pen, and the other jigsaw with blue pen. Hide the pieces of both jigsaws around the garden. Divide children into red team and blue team. First team to find and assemble all of their jigsaw is the winner.
Obstacle course
Scavenger hunt
You can still play all of the usual party games outside:
Musical bumps/statues
Grandma's footsteps
Pass the parcel
Sleeping lions
Duck duck goose
What's the time mr wolf?
The Maltesers game - Place a large bowl of maltesers in the middle of the circle of children. Each child needs a straw and a paper cup. They roll a dice until someone gets a six. When they do, they have to try to get as many maltesers into their cup by sucking through the straw. They keep doing this until another person rolls a six and starts having a go. This is lots of fun as children keep laughing as they try to suck up the maltesers!
You can also play messy party games:
Thread lots of Hula Hoops, Cheerios, Polos or mini donuts onto two long pieces of string. Get adults to hold the strings up at child height. Then divide the children into two teams. With their hands behind their backs, they’ve got to eat all until the string is empty. The first team to finish is the winner.
Freeze some toys (such as plastic animals) and have the children try to break the toys out by spraying with water pistols or digging with spoons…
Create two identical obstacle courses with hoops to crawl through, blankets to wriggle under, and chairs to run around. Place a full bowl of jelly at one end of the course and an empty bowl at the other end. Make two teams and give each guest them a spoon. Each team races the other to take jelly from the first bowl and place it in the second. The winning team is the one who manages to successfully transfer the most jelly.