No, I wouldn't want to live on a desert island by myself. I have a loved one, and I don't want to live the rest of my life apart from her.
So, assuming that the requirements (such as food, drinking water, and shelter) are covered, I'd like a decent laptop, a solar charger, and some kind of satellite connectivity to access the Internet.

I'd probably last a year or two. After that, I'd get bored and want to return to civilization.