I'm uploading this as an example of how we have encouraged young people to participate in a range of activities. It may be possible for you to edit it to make it suitable for your setting. The young people each got a passport and then had a number of activities that they could choose to visit - each activity had a stamp that they could then have added to their passport after the completed the activity. It was a good way of giving the young people a choice but still having an incentive in place to encourage them to complete all the activities.

This is a set of sheets (the set I used, I laminated) that you can use to record the completion of a staged set of swimming activities. These are based upon the Scout Staged Swimming Badges but our PE teacher also decided they were useful as he felt they formed a nice progression that was suitable for our Special Needs students. The sheets have the room to write on a students name and then space to tick off each activity as they complete it. (You'll need a permanent marker to write on a laminated sheet.)

A sheet showing how we scored a Spiders Web Team Building Activity on the County Cub Competition. It includes a picture I drew (on the computer) of a Spiders Web. They are fairly easy to set up with some rope and knots. To score highly teams have to work effectively together.