Travel to Capri from Praiano

Bus to Positano 15m then ferry to Capri 30 m.

Schedules here.

https://www.positano.com/en/ferry-schedule

First off, you want to get your return Sita ticket in Praiano at the Tobacco shop right by the bus stop. Much easier than trying to buy it later for the return from Positano to Praiano. You can take the early bus right down by the church San Gennaro to Positano. Walk down to the main beach from the bus stop, and purchase your ferry ticket to Capri, and again, purchase a return as well back to Positano. Your tickets will be scheduled departures. Check ahead of time for the schedule, and then you have an idea of how much time you have in Capri. If you want a good lunch on Capri, try taking the little bus up to Anacapri and walking the little pedestrian street and finding something to your liking. The buses are small, so leave yourselves enough time to get back to Marina Grande for the return trip back to Positano. There are a few departure areas that aren't part of the long pier, so make sure you ask where your # departure is before heading down the pier. Have fun and enjoy!! Best view in Capri is from Monte Solaro at the top of the chair lift.