I can highly recommend this guide in the Dorling Kindersley Eyewitness Top 10 Guides series. Not least because I was personally involved (in my own small way!) in the preparation of the guide.
The guide contains dozens of Top 10 lists for Corfu and the Ionian Islands - whether you have plenty of money or are on a limited budget. From the Top 10 bays and beaches to the Top 10 myths & legends, picture postcard villages and outdoor activities. To save you time and money, there is even a list of the Top 10 Things to Avoid.
The guide is up to the usual excellent standards of all Dorling Kindersley publications and I suggest you obtain a copy before you visit Corfu and / or the other islands.
I've just come across this new Corfu website, which I think is a great initiative. It's called Green Corfu and as the name would suggest, it aims to promote a 'greener' side to Corfu than that known to most people.
As the site says in its introduction - Corfu is a green island, because of its lush vegetation all year round, full of olive trees, cypresses, and a wealth of other plants, insects, birds and animals. It’s an island that is ideal for tourism all year round. You can walk through the beautiful countryside, go horse-riding over ancient paths, cycle amid awe-inspiring olive groves, taste traditional local products, visit traditional wineries, olive presses, picturesque churches and ancient castles, relax and come in contact with pure natural beauty.
You can find sections on Nature, Eating, Healing, Corfiot Products, Recycling / Green Energy, Walking and Accommodation. It's well worth a visit and I wish them all the best!