If staying in Capri for a few days, is it easy getting on and off the island to see amalfi coast?
In season, there are boats that run from Capri to Positano and probably on to Amalfi town. Boats also run between Capri and Sorrento - less frequent off season.
As long as you know its $25 each way per person.
So $100 each time you want to go on and off the island.
It's very easy, but schedules are limited. You can get to Positano, Amalfi and Sorrento from Capri, but there are only a few runs each day. Just know when they leave and when they return.