German to English Other Tourism & Travel abbreviation

This occurs several times in a schedule for activities at a children's camp.

e.g. "Segeln A. u. F."
"Reiten A. u. F."
"Tennis A. u. F."

does anyone know what it stands for? It's extraordinarily hard to google because the search keeps turning up millions of hits for "auf".

Thanks in advance,

Moabit