ooh ive heard of this lake, is it on the other side of the airport to town? sounds a lovely place
I went with my daugther last year and we only went for a week, we had a day ona boat but did the island trip, this time we are doing the marine park / alonnissos trip so we can see the dolphins, apparently they are around so no worries about that, will be a lovely experience im sure, hope you have a wonderufl time
dont forget to visit the Windmill Restautrant in Skiathos Town, best place to eat on the island :-) a truly magical evening, If theres only 2 of you book the 'honeymoon' table for the most stunning views of your life, i had my daughters birthday up there and it was an experience never to forget