South America.
You don't need to get a visa prior to arrival for most countries.
Everything is inexpensive, including cell service. Young South Americans are very big on social media, so you can find reloadable SIM cards on the cheap. Plus, there is WiFi all over the place.
Buses from city to city are cheap and comfortable.
Ecuador is very cool, and you can take a short flight from Quito or Guayaquil to the Galapagos Islands and see a natural treasure of unimaginable richness.
Uruguay is probably the chillest country of all time.
Santiago, Chile, is pretty damn cool too.
People think South America is dangerous, but places like Chile, Paraguay, and Uruguay are a far cry from the violence of Venezuela or the horror stories you hear about street crime in Colombia. Still, the slight whiff of danger makes a South American adventure all the more exciting.
And believe it or not, a lot of folks love Yankees down there.