There is a fabulous trip.....Corfu town by boat....by night! we have done it a few times from various resorts (we always stay in the North or North east of Corfu......) I think you would be able to book it from Sidari, they will bus you to kassipi for the boat......it sets off about 3 pm.....takes you on a lovely sighseeing cruise down the east coast, drops you off in Corfu town harbour about an hour later.
You then have til about 10 pm to wander and wonder at Corfu town by evening, have a drink at the Liston and haggle in the shops.
On the way back they play traditional romantic Greek music and you can have a drink on deck......you will be back in Kassiopi by about 11 ish......
It is truly a memoranle experience and one I will be doing again myself this July XXXXX