We do a drill/game at the end of each practice that works on teambuilding. If you're looking for those, I can help and I'm sure there are numerous others on here that will share. If you're looking for activities outside of practice that work on teambuilding, have a team dinner of pizza. Before serving the food, tie each hand of each player to the player next to them on each side thus making a complete circle of players tied to each other. Next, put the Soda, pizza, paper plates, napkins, etc, in the middle of the table and tell them to go at it. They'll have to work together and figure out how to set their place, get their pizza and eat. It literally takes the entire team working together to accomplish and there's always a lot of laughing and joking.