A hedge laying course.
Unfortunately only available from Nov - Feb normally.
Mrs Q and I tend to buy each other opportunities to learn skills rather than stuff. So far we've done sheep shearing (both of us), hedge laying (me), nalbinding - a sort of Viking knitting (Mrs Q), spinning and dyeing (Mrs Q), fruit tree pruning (me).
Also, bungee jumps.
Not sure where your friend is based but they have some good value courses at The Earth Trust in Little Wittenham, Oxfordshire.