We've opted for Goofy Games as it just seems so appropriate.
You will be tasked with taking on your mates in up to 10 different games/challenges.
Now for the Goofy bit, how to describe that to you? How about duelling in inflatable Vicky Pollard suits. Or Wurzel Knockout, take aim with water bombs to take out the Wurzels. Maybe Welling Wanging will give you some idea.
Please check out your chosen location for a comprehensive description of the Goofy Games lined up for your party.
Wacky, crazy, nutty, odd, zany are all suitable adjectives to describe this one to you.