Hm, I think you can ask yourself: what do I want to do with this hobby?
Just 'fill the time' or 'connect with new people' or 'learn something new and fascinating' or all of the above?
Also, if money is a consideration: something to do for free/cheap/might cost or save some money/might make some money...?
Can you do it alone and/or with others...?
Do you want something creative or more 'down-to-earth' (or both)?
Some kind of exercise might be nice, like dancing or such? Or rollerblading?
Something that involves the whole body... Or working with wood (making or restoring furniture

Beware of any iffy chemicals here though..)
I think it would be good to find something to take you from the computer and into Nature/outdoors..
Or possibly to connect you with other cool people iRL...?
How about karate/kung fu/tai chi?