..... I ended up stuck under the highway in the middle of the Duarte market!
LOL, I remember the first time that happened to me. I was like, WTF
Fastest would be JFK or 27 but as you know one goof up and you are in a world of trouble.
The easiest would be to take Churchill to the malecon and direct to the airport. No tricky turns taking this route.
Leaving PriceSmart head back to Churchill and make a right. Take Churchill to the malecon. To make sure you are going in the right direction on Churchill just ask anyone, el malecon. Driving on Churchill go past 27 de febrero and continue driving straight. Once again just ask for el malecon.
At the end of Churchill you will come to the malecon. Make a left here. From this point on always have water on the right and buildings on the left. After a few minutes you will start to have the larger hotels on your left, water on the right. Once the large hotels end be on the lookout for the cruise port. There is always a cruise ship or freighter docked there so you can't miss it. Right after the port keep your eyes open for a bridge. Not a large elevated one but a bridge pretty much on the water. Make a right, cross the bridge and make another right.
From this point on stay on the main road. Water on the right, buildings on the left. This will be avenida espana. There are a couple of twists in the road but stay on the main road. Continue driving and in about ten minutes you will be on the main highway headed to the airport.
Not the quickest, but I think the easiest.