For an active recovery day the activity selected needs to be restorative for that person. Its a great opportunity to work on a skill. The effort used should leave the person feeling energized not depleted.
One example is 20-25 minutes at 60-70% effort run, swim, row, airdyne. The pace is slower and conversational with a focus on efficient movement patterns.
Add some upper and lower body mobility/maintenance work. Addressing things before there is an issue. You can let each person decide what they work on. Have them pick 1-2 areas upper body and lower body to address.
Some have their athletes do Marc Pro sessions for recovery. Think in terms of inflammation maintenance.
If you would like more info about using a Marc Pro with recovery let me know.