Caribbean Carnival’s big daddy kicks into high gear the moment Christmas is over, and the run-up is as much fun as Carnival proper. Hit the mas camps to check out outrageous costumes and steel-pan bands as they ramp up for their annual battle, Panorama. J’ouvert, or “dirty mas,” at daybreak on Carnival Monday, is a you-only-live-once chance to smear yourself head to toe with paint, mud — even chocolate. It’s the island’s dry season, so there’s no threat to body paint. But be forewarned: between hotels, flights and costumes, it takes six months to plan.