There are many. One of them is trekking. I trekked in Bhutan and in black forests. Both are very close to my heart. I stayed with a tribe for a week who use minimal electricity and resources. I stayed with a German family when and helped them in farming, animal husbandry I did scuba diving in Andaman islands and it was an unforgettable experience. I wanted to do that all the time. In fact, I decided to learn swimming after that to perform deep (or proper) scuba diving.

I would love to do all of these (teach, share and learn). I can teach graduate math (most people don't want it :). I can teach Indian way of cooking and am sure that you will regret for not preferring Indian, vegetarian food all your time. Apart from a very small set of (obvious) things, I don't mind sharing anything. To be frank, I think that sharing not only reduce human consumption/foot print but also connect people.

I am happy to cook for my hosts and have a long conversations.

To be frank, my interests keep on changing.