Little adventures just wait on your doorstep and are way more accessible than the big holiday.
I personally like to look at a local map and pick little excursions, even making a list of little adventures I would like to do and picking one whenever I have time. I think reading a guide book of your area is also a good approach, to see the place where you live through the eyes of a tourist. Often we visit a foreign country more thorough than we do our own.
Other people might like the spontaneous approach more, of just following an unknown road or trail and explore.