The big thing you need to do next is the harp / getting your book back so you can play all the songs. You've got everything you need for that, except the harp...
The thing the Turtle says is a clue - take each word and the first letter is the directions in the swamp. (I don't remember the exact wording off the top of my head, but basically go west from the screen that has the "SEER" sign on it. You'll find
the harp in there somewhere.
Not sure if this is a bug or not, but I played the lovesong for the potion maker, and the fisherman went to her. I then gave her the rose as well, and now he's back near the lake and I can't get the Turtle to say his "instructions" again, nor will they let me go into the swamp that direction...