The vinegar/water/salt will result in a product much like those available commercially, so probably your best bet for pickling.
Hot pepper jelly is a favorite around here, so I like to make some of that up when I have fresh peppers.
If you like pepper "poppers" filled with cheese:
-Choose some nice fat peppers, cut in half, remove the seeds and white membrane.
-Blanch them for thirty seconds or so in boiling water, remove from water and plunge into cold water to stop cooking.
-Freeze on cookie sheet so they don't stick together...when fully frozen dump into a plastic bag for term storage. (At this stage I like to dip the frozen peppers into cold water, which immediately freezes and forms a nice protective film on the pepper surface that protects it from freezer burn.)
To use, just remove however many peppers you want, fill them with cheese, and pop into the oven. Other fillings work, too...