Juan, the crab, is a Mexican immigrant. ¡Que Padre! is a common expression of delight/excitement. It means "so cool" or "how awesome." Guac is short for guacamole, a spread made with avocados, and tamales are great with it; tamale here is intended as a pun-ish way of referencing tomorrow. Tequila goes great with both, and sunrise happens every tomorrow.