The MX-5 is a great little sports car for someone looking for some fun on the road.
The earliest ones are getting a little long in the tooth and are looking a little tired.
Go for an NC model, that's from 2005-on, and you shouldn't go wrong. They're reliable, user-friendly, they look good, and they're great fun to drive.
Look for a low-mileage example and avoid any that look like they might have been used in competition.