The main thing to see in the Manta harbor area is tuna boats coming in and unloading their catches. This is very interesting, but can only be seen from the deck of a cruise ship, since access to the pier is restricted to those with business there. Also this activity is better viewed from above.
This is a beautifil beach about 30 minutes South of Manta on the Via a la Costa. It is next to a tiny village, but there is never anyone on the beach. You can just drive your car right up to where you will be sunbathing!
Beware of the strong undercurrent and strong waves - this is no joke!!!