For my main guy I always make sure his Handiness skill is at level 10, plus I cheat and give him the 'Handy' reward trait so he can give most objects an instant upgrade (or repair) without needing to collect and use parts. I just need him to be technically advanced as he's always on some kind of action adventure. Which brings me to my favorite trait:
Loves the Outdoors.
I love the outdoors myself, so my sims tends to spend a lot of time in nature as well: in the jungle, walking/jogging around the neighborhood, or the woods, fishing and gathering stuff. I also use the 'Foraging' mod by Brazenlotus, which I think is a really great asset to my game play and I hope we get something like this in TS4 one day. It's great for my survivalists.
My 2nd favorite is Hothead and then usually something creative. I guess because I identify with those the most...although I never ever play as my sim-self. That's a whole other dimension I'm not willing to step into. :#
I do think that the traits/personality system needs a bit (huge amount) of work as it doesn't always function as something that should be more in-depth and unique to my sims.
