Just an update... We did dive while in Positano. I found the good food and wine to be overwhelming, and could only find time on one day. We traveled to Pompeii and Mt. Vesuvius, and Ercoleum a couple days - the drive from Positano to there was so curvy, I fought motion sickness the whole time. So I decided not to go on another 45 minute ride to Sorrento for diving. I found La Boa in Priano - just a few Kilometers down the road from Positano. They came to the Positano pier and picked my husband and I up. They had all the gear, as the only thing I brought was our C-cards. The equipment looked quite new - the mask and fins a little used, but I was glad to have them at all! We went out to Li Galli, which was a quick 10 minute boat ride to a tiny archipelago made up of three islets. The dive was cold, maybe low 50s. We saw a couple Octopus, red coral, Scorpion fish, an eel, a couple schools of tiny fish, a few anemones, many sea urchin, lots of grasses, the wall was pretty - rocky with little corals and grasses. Vis was about 30 feet or so. I was glad to have gone diving; however, I did not realize how cold it was until I got to the top and tried to use my hands to unhook something and they were not really functioning. Evidently the water temps do not change too much - I used a 5 mil suit lined with fleece. Good experience, worth it!