Into town, where the bus stop is, would be nearly two miles on foot along Via IV Novembre. It's uphill from the hotel and there are no sidewalks, so you need to be aware of cars.
It's a little further but not uphill to the marina area restaurants, about two miles.
Yes it is ! But you have to use the main rd,I believe there’s a bus stop just outside entrance to the conca.last yr we were curious about the marina Della lobra as we would watch from our terrace the boats leaving in a morning,we never got round to paying a visit,we were too busy touring other places of interest.We are returning May so it’s on our list , and we intend walking ! Also may get a boat from Della Lobra to isle of Capri,last time ferry from Marina Grand , hope this answers your question
The Delfino hotel runs a free shuttle bus into Sorrento or you can get off at Massa Lubrense. It is possible to walk into Massa away from the road but last year it was a bit overgrown when I did it because not enough people use it. You can get the free map from the tourist information office in Massa Lubrense which covers all the old mule tracks in the area and you can walk all the way to Sorrento in under an hour keeping away from the road. There area number of boat trips run by the Co-op at the Marina de Lobra and the famous Angelo's taverna should not be missed. Massa Lubrense also boasts some of the best restaurants in the whole Sorrentine/Amalfi area. Eva bus runs every 20 minutes from Massa Lubrense into Sorrento from 6am till midnight and it take about 15 minutes. Just round from Angelo's Taverna is a swimming area with fresh water showers to rinse yourself off. The Delfina hotel also has its own tiny private beach if you prefer sea swimming to it's pool.