As far as Cyrenaic ethics is concerned, the most relevant source is Diogenes Laertius:

We are immediately given the kernel of Cyrenaic ethics: pleasure is the end and pleasure is desirable in virtue of itself. On the other hand, the importance of happiness is derivative of pleasure, since happiness is not desirable for itself but in virtue of particular pleasures. In light of the predominance of pleasure over happiness, it has been claimed – quite correctly – that the Cyrenaics constitute the only exception to Greek eudaemonism: the view, absolutely central to Greek ethics, that happiness is the end of life. Later, while still endorsing the claim that the Cyrenaics are anti-eudaemonists, I shall restrict the scope of Cyrenaic hedonism by describing the secondary, yet proper role of happiness in the ethics of the Cyrenaics. For the moment, let us concentrate on the kernel of Cyrenaic hedonism, namely on the view that pleasure is the end.