In reply to elcidcampeador:
I'd second Rocher des Potets and Rocher Canon, and maybe add Rocher Fin - it's a bit more of a walk, but a beautiful spot and nice climbing.
Bas Cuvier might be worth avoiding, if only because the mess there can be a bit unsavoury.
As a general point, I'd try to manage expectations about "easy circuits" - even on a yellow circuit you'll get the odd thing which is so polished as to be almost impossible, or highball, or just quite hard, and quite a lot that's definitely proper technical climbing with the need for careful footwork and balance. Don't be put off, but also don't go in expecting a beginner circuit at font to be like a beginner circuit at a bouldering wall, ie a series of jug ladders to help nervous novices in trainers to build up confidence.