I'd guess:
. One member races downhill towards a sandpit
. Digs through the sandpit
. Finds a locked chest
. Returns up the hill with the chest
. One tribe member races downhill to a tree
. Climbs the tree
. Crawls across a large branch
. Takes hold of a key
. Heads down the tree
. Runs uphill with the key
. Unlock chest with key
. Grab rocks inside
. One tribe member uses rock to break tiles
. Release a tribe coloured ball from a fallen bag
. Two tribe members run over to a puzzle platform
. Place the ball at the edge of the maze
. Get ball to the end of the maze
. Release tribe flag
. One tribe member hold tribe flag in the air
. Win immunity