I've been meaning to check to see if the little inserts for the fusebox are available, to add extra circuits. Something like that would be perfect for a radar detector. There's one extra fuse position in the small box behind the driver's door (at the side of the dash) and many more in the fusebox under the hood.

I'm not sure that your car is like mine, but on my '96 the interior of the underhood fusebox is cabin space - that is, it's connected straight through to the interior, right behind the instrument panel on the left. Running wires is easy.