1 sheet of standard size poster board per team
Break class into teams of 8-10 members.
To get students to feel comfortable in working in close proximity with each other. (Communication principle - The closer proximity that people or groups of people can work together, the more efficient and accurate is the exchange of information. The closer you are to someone, the more likely you are to pay attention to that person and to pick up non-verbal communication.)
To get all team members on the island (poster) at one time. "On" means that no part of any team member's body may be touching the floor which surrounds the island. "On" also means that no props, such as chairs, ladders, etc., may be used.
The easiest way to do this is for 4-6 people to form the base and the remaining 4-6 to sit on the shoulders of those people.