Cool website with a lot of ideas of what you can do during the rest of your trip here!
Viña del Mar and Valparaiso are two beautiful coastal cities right next to each other. By car, it takes about 90 minutes to get to Melipilla and 90 minutes to get to Santiago.
San Pedro Atacama Desert is a 2 hour flight from Santiago.
If you're a wine lover, there are lots of vineyards near Santiago and Melipilla!
Pomaire is a short drive from the town of Melipilla and is known for its traditional pottery.