Greek thinker who believed life should be luxurious and pleasureable?

That would be Epicurus. Epicureanism, the philosophy he founded, emphasized pleasure as the highest good, but not necessarily hedonism in the sense of fleeting sensual indulgence. Epicurean pleasure was defined as *ataraxia* (tranquility) and *aponia* (absence of pain), achieved through moderation, friendship, and intellectual pursuits. While luxurious, it was a restrained luxury focused on inner peace rather than excessive indulgence.