there are several across street when you get off the ferry.
My suggestion would be to grab cart, head south and stop at Soggy Peso for a drink.
Then continue south and stop at the The Joint and grab a frozen mojito to go.
Continue south and walk around Punta Sur. Take lots of pics. Make the turn back north and stop at Villa la Bella and sit in the swings at the bar and have Pina Coladas. ( I don't think we have talked much about Villa la Bella much on this site but we really liked it. Amazing Pina Coladas and nice view)
Stop into Isla Brewing Company and do a quick tasting. (it is very informal)
Head all the way up and park on the street by North Garden and then you can walk to the beach and hang out.
If you want to do the market thing, you can walk to there and shop. Plenty of restaurants there as well.
There are plenty of things to fit in between the stops above, just depends on what you are into. This gives you a good loop around the island.