What you got is what you got. There are no devices that will make it any larger than it already is. And if spankin' the monkey would make it bigger, mine would be over a mile long.
I'm pretty sure surgery isn't all that desirable. It's probably a little dangerous and who knows (I don't) what the side-effects may be.
Forget some pills...that's probably the biggest scam going on now.
The only thing I would even consider are the excercises that are supposed to work out and enlarge the spongy tissues in your penis (Forget what those are called). And I say supposed to because I haven't found anything that shows that it works.
But if I've learned anything from lurking on these boards it's that you should learn to work with what you got. Expand your techniques, learn new things. Use your whole body for love makin', cuz. I'm sure if your efforts to please your partner are genuine and sincere, it will be appreciated and reciprocated.