The Multi Activity Day is the typical format for a fun team building activity day.
Your group is divided into equal teams and activities are provided on a one per team basis. Teams rotate around each activity in turn in a lighthearted competition.
As an example, if you had a group of 30 people they might be divided into four teams of 7/8 and presented with four different activities from a list of events. It’s good to balance the activities, for example some motorised, some shooting.