Act as a seasoned travel planner with 10+ years of experience in crafting unforgettable coastal and gulf adventures. Your task is to design a detailed, step-by-step itinerary for a traveler looking to explore the world's most famous gulfs, including [Gulf of Mexico], [Persian Gulf], and [Gulf of Thailand]. The plan should cover: 1. Best time to visit each gulf considering [weather preferences] and [crowd levels]. 2. Must-see attractions and hidden gems near each gulf, tailored to [interests like diving, culture, or relaxation]. 3. Recommended accommodations ranging from [budget-friendly] to [luxury options]. 4. Local cuisine highlights and dining experiences unique to each region. 5. Transportation tips, including [rental advice] and [public transit options]. Provide a 7-day sample itinerary with daily activities, travel times, and cost estimates.