Carey Robson wrote:

Does anyone know anything?

Yes! :-)

June in particular.

Not the best time of year, water-level wise: think more about April and May.

What are your plans?

I've been there twice, travelling all around the country paddling white
water. You can find every class of water there, up to class VI, but
mostly it's class II and III, with some rivers being class I and fla****er.

Much of the country in mountainous, the roads are not very good
(understatement), depending upon where you want to go (North is better
than the South), road signs are rare and often tricky to decipher (often
in Greek alphabet) and the people are very friendly and hospitable. You
can camp almost everywhere (official campsites will still be closed, and
they are rare), with some incredible camping spots being there for those
who search for them.

If you stay away from the touristy places near the coast and islands,
almost everything you buy there is quite a bit cheaper than you're used
to from a western country.

The pictures and trip reports of my trips can be found he
http://wilko.webzone.ru/greece.html

If you have more specific questions, let me know.

--
--
Wilko van den Bergh wilko(a@t dse d.o.t)nl
Eindhoven The Netherlands Europe
Look at the possibilities, don't worry about the limitations.
http://wilko.webzone.ru/