It would depend on whether you like activity or relaxation. I'd go for a mix; hiking, jogging, working out, reading, painting, drawing, darts, target shooting, skiing, woodworking or carving, knitting, needlepoint, photography, nature...the list is endless. Get out there and look around. Find something you think might be fun and go from there.
I do crafts of all kinds. Simple ones, and then more complicated ones. If you have the money to do it, you can go to a big Craft/Craft Supply store (Michaels is a chain that is almost everywhere!) and get some ideas. To make it less complicated start with a Craft Kit in which all the supplies are included. I just bought a stained glass, mosaic kit to make 4 coasters. You can also look up on line free craft ideas, or the type of craft you think you may like to try. It is fun, and it is rewarding to display the things you make or give them as gifts!