**Day 1: Departure from Seattle**
Depart from Seattle and embark on your journey to Bangkok, Thailand. Upon arrival, transfer to your accommodations at the Mandarin Oriental Bangkok, a luxury hotel on the banks of the Chao Phraya River.
**Day 2: Explore Bangkok**
Visit the Grand Palace and Wat Phra Kaew, home to the Emerald Buddha. Next, visit Wat Pho, known for its large reclining Buddha. Enjoy a dinner cruise on the Chao Phraya River.
**Day 3: Day trip to Ayutthaya**
Take a day trip to Ayutthaya, the ancient capital of Thailand. Explore the historic park and its temples, which are UNESCO World Heritage Sites. Return to Bangkok in the evening.
**Day 4: Explore Bangkok's Markets**
Visit the vibrant markets of Bangkok. Check out the Chatuchak Weekend Market, the largest market in Thailand, or visit the floating markets such as Damnoen Saduak or Amphawa.
**Day 5: Travel to Chiang Mai**
Fly to Chiang Mai, located in the mountainous region of Northern Thailand. Check into your accommodations at the Dhara Dhevi Chiang Mai, a luxury resort designed in the style of ancient Thai temples.
**Day 6: Explore Chiang Mai**
Visit the old city of Chiang Mai with its 300+ temples, including Wat Phra Singh and Wat Chedi Luang. In the evening, explore the Night Bazaar for some shopping and food.
**Day 7: Elephant Nature Park**
Spend a day at the Elephant Nature Park, a sanctuary for rescued elephants. Learn about and interact with these majestic animals in a responsible and ethical way.
**Day 8: Cooking Class and Spa**
Take a Thai cooking class and learn how to prepare traditional Northern Thai dishes. In the afternoon, enjoy a traditional Thai massage at your resort's spa.
**Day 9: Travel to Krabi**
Fly to Krabi, known for its stunning limestone cliffs and clear waters. Check into your accommodations at the Rayavadee, a luxury resort located on the edge of Krabi's National Marine Park.
**Day 10: Four Islands Tour**
Take a boat tour to the four islands - Phra Nang Cave Beach, Chicken Island, Tup Island, and Poda Island. Spend the day snorkeling, sunbathing, and exploring the islands.
**Day 11: Rock Climbing and Relaxation**
Try your hand at rock climbing at Railay Beach, known for its limestone cliffs. If rock climbing isn't your thing, simply relax on the beautiful beach and enjoy the surroundings.
**Day 12: Travel to Phuket**
Transfer by boat or flight to Phuket, the largest island in Thailand. Check into your accommodations at the Trisara, a luxury resort with private pool villas overlooking the Andaman Sea.
**Day 13: Explore Phuket**
Visit Phuket Old Town with its Sino-Portuguese architecture and local markets. In the afternoon, relax on one of Phuket's many beautiful beaches like Patong Beach, Karon Beach, or Kata Beach.
**Day 14: Phi Phi Island Excursion**
Take a day trip to the beautiful Phi Phi Islands. Visit Maya Bay, where "The Beach" was filmed, and enjoy snorkeling in the vibrant coral reefs.
**Day 15: Leisure Day in Phuket**
Spend your last day in Thailand at your leisure. Enjoy the resort's amenities, relax on the beach, or book a yacht trip to explore the surrounding islands.
**Day 16: Departure**
Transfer to Phuket International Airport for your return flight to Seattle.
*This itinerary can be customized to cater to individual preferences and interests. Remember to respect the local culture and environment during your travels. Enjoy your romantic and unforgettable honeymoon in Thailand. Safe travels!