Build the record breaking tower, how many times can you beat the current record
Newspapers and masking tape. Tape measure and board to record the records.
Build a free standing tower, when its tall enough to beat the current record on the board (you can beat your own record) ask for it to be measured, the winning team is the team who held the most records (not the team with the tallest tower - although you could have two winning teams). Its about getting organised quickly, the first record can be a 1cm tower!!.