For me, it's not Positano itself but more where it is situated. I've related this before but two years ago in early March, we took a SITA bus from Sorrento to Positano, even after hearing that it was still pretty much closed for the winter. Unsure about where to get off the bus, we disembarked too early, like 2 stops early. Oh crap, what do we do now?
Not wanting to wait for the next bus, we observed that the winding shore road was slightly downhill, so we started walking. It took about 45 minutes, a quite pleasant walk actually, and I'll guess it was a little over a mile to the entry road to lower Positano. But what scenery! We got an up close & personal view of what you see in pictures or videos or movies. We kept saying that pictures aren't going to do these breathtaking views justice. And they didn't.
Frankly, the bus ride from outside Positano all the way to Vietri sul Mare--with a change of bus in Amalfi--is one of the great motor paths that exists. See the whole length of the coast if you can.
Enjoy your planning!