While the image above suggests trying new cuisines (I had to go with the Empanadas), this advice truly applies to all elements of traveling. If you go to a foreign country, you should be interested in learning their culture. You should be interested in what they eat, what they do for fun, and how they celebrate their history.
You'd be shocked how many McDonalds, KFCs and Subways you can find in foreign countries. Does that mean you should eat there? Absolutely not.
Similarly, don't sign up for tours that will just take you to the town square and back. It's important to find a balance between tourist-friendly activities and ones that show you an insight into less frequented corners of your destination.
Some of my favorite tours are ones that took me into a family's home for a meal and a walk around the property. It's a win-win because I get a delicious meal and an insight into the culture while the family earns income from my visit.
My recommendation is to try at least two dishes that are common to the area during your stay and to look for eco-friendly tours that help support the local population.