Hi,
One thing you must know about us guys is that we hardly ever look
beyond the obvious. E.G. If you bake a cake for him and tell him
that it was bought from 4 Leaves, he'll really believe that. Hence,
it's best for you to be direct, but in a subtle way.
Since he's in ODAC, that shows that he likes the outdoors. Getting
him something related to sports would be good, such as a water
bottle, wristband, waist pouch or even a haversack for all those
expedition trips, hikes, etcetera.
To further get your message across subtly, slip or tie a note to
the gift, with stuff on it like, "I feel really happy hanging
around with you. You're someone I really cherish."
Hopefully, he get'll the hint. 
