Carnival Horizon has lots of dining options available on the Lido Deck. Guy's Burgers, Blue Iguana Cantina, Pizzeria del Capitano, Seafood Shack ($), and the Lido Marketplace. This is where the fun, (and the crowds) are going for lunch. I'd probably see if the "Captain's Pasta Bar" is open for this first meal and a chance to relax. Enjoy your cruise!