I am an extreme introvert and sometimes I really want to just hibernate. I let myself take it easy but, unless I am ill, I always go out at least once. Here are some simple outings that you can do anywhere, even when you don’t feel up to much. They aren’t about mind-bending scenery or tourism, just being where you are.
A walk in the park.
A trip to the grocery store for water or snacks.
A stop at the corner store or market for fruit.
Just walking around and trying to figure out which Chinese characters (or what-ever the language is where you are) I recognize on signs.
When we went walking in France with my son (in the days before digital cameras-he was 12), after we settled for the day I would send him out to scout restaurants as language practice (I stayed within sight, but let him do it on his own). Since he decided where we ate he was quite amenable to trying new things. Turned out he really likes duck.
I have had some great experiences, and many, many tiny cups of tea, as a result of just going out, without a detailed agenda.