One of my favorite travel memories was being "adopted" by a group of local Vietnamese friends who lived in Nha Trang.
We met them at a waterfall and while I spoke no Vietnamese and them no English, they invited us to join their picnic. We had a lovely afternoon together and went and had drinks and coffee with them afterwards. This progressed to being invited back to their house for dinner, where we all sat on the floor and ate a communal meal - again communicating using lots of gestures, hand movements and smiles.
After, they invited us to go dancing with them as it was Halloween and there was a big party happening in town. At 2am, they told us that we must meet them the next day so they could take us fishing! It was lovely to be shown around by such friendly locals.