hiya,
there are many trips that go with the tour operators, such as visits to the old corfu town and to waterparks and suchlike, but to be honest it is much cheaper if you book with offices on the main strip in sidari, they are exactly the same trips but as i said its cheaper and whats more, you get more time to spend in the places.
seen as though it was a few years ago that i went, i cant remeber prices..
hope this helps
Martyn