Well 6' 4" wipes out an MX-5, that's for sure.

You could also consider an Audi TT, a Honda S2000 or a Nissan 350Z roadster.

But, sensibly, for touring you'll be better off in a soft roadster such as a BMW Z4 or a Mercedes SLK, on 16" or 17" wheels with deep profile tyres to protect your backs and save the expense of replacing potholed tyres.

You'll be safest of all with an SLK because it has a folding tintop, so you could take the risk of leaving it parked with your belongings inside.