First place, you will be exhausted if u are coming from USA. Also you 've never driven in Greece before, and you want to do it after dark???? Especially when it will take you 45 minutes minimum, maybe more, to get thru passport control, claim bags, & hit the ATM for fomr Euros. No no no bad idea. . MUCH better idea to go to a nearby hotel, have something to eat & crash. Then next AM, have a nice breakfast, back to Airport, pick up car and off you go, on the big intercity highway that skirts Athens & zips you along to the Corinth Canal area. Then you can enjoy the lovely spring morning, catch a glimpse of the sea... if you feel like it, hop off the biggie highway where the sign says "Isthmia" and spend 20 minutes or so at the OLD Bridge... the only way you get a good look at the Corinth Canal (sooo deep sooo skinny). Then back onto big highway, and 15 KM later, hop off on RH side & go 5 miles to See NEMEA -- the overlooked gem, the "Olympia wannabe" Sacred Games site. Ruins, temple columns, FAB stadium with racing-blocks 2300 hrs old -- and NO tourists. Then on to Nafplio by noon.
One good place for o-night, medium-price, is Hotel Avra, http://www.hotelavra.gr/, which has a free shuttle 24/7 (only requirement is, at time of booking, you specify needed to/from shuttle times, so they can plan). It's 25 mins away, right on a beach (in Rafina) has a cafe on premises, or plenty of other tavernas nearby.