Car Hire (San Francisco to LA) - 2 seater convertible

[Hobo]

I'm taking my 15 year old son to California in July to visit a few Universities, flying into San Francisco and then flying out of Los Angeles. The plan initially was to fly between the two, however it became apparent that one of the best roads in the world goes between the two, so the plan is to now drive between the two, with a couple of stop offs (maybe Carmel & Santa Barbara).

I'd like to hire a 2 seater convertible, Porsche Boxster or something similar as want it to be a fantastic experience for him.

Any recommendations on where to hire one ? Ideally pick up and drop off at the relative airports, but if that isn't possible it not an issue.

[Hobo]

There don't appear to be any mildly interest rental options with the mainstream company unfortunately, and probably as you say to do with the 'one way' rental.

I need to find something.