5-Day Honeymoon Itinerary in Kaua'i

• Day 1: Beach Day - Start your honeymoon with a relaxing day on beautiful beaches, soaking up the sun, and enjoying each other's company.
  Highlights: Po'ipu Beach, Anini Beach, Hanalei Bay.
  
• Day 2: Adventure Day - Get your adrenaline pumping with some fun outdoor activities. Hike to the stunning Waimea Canyon, enjoy a scenic helicopter ride, and end the day with a sunset sailing trip.
  Highlights: Waimea Canyon, Blue Hawaiian Helicopters, Kauai Sea Tours
  
• Day 3: Romantic Day - Spend the day exploring romantic spots on the island, discovering some breathtaking views, and indulge in a couples massage.
  Highlights: Hanalei Valley Lookout, Pu'u Poa Beach, Wailele Falls, Halele'a Spa.
  
• Day 4: Cultural Day - Experience and learn about the rich culture of Kaua'i. Visit heiaus (Hawaiian sacred sites), kayak down the Wailua River to see the lush valley, and attend a traditional luau for dinner.
  Highlights: Wailua River State Park, Smith's Tropical Paradise, Luau Kalamaku.
  
• Day 5: Nature Day - Experience Kaua'i's natural beauty and wildlife by taking a boat tour down the Na Pali Coast, exploring Limahuli Garden and Preserve, and taking a dip in a waterfall.
  Highlights: Na Pali Explorer, Limahuli Garden and Preserve, Upper Waikani Falls.
  

Time and Costs Estimates:

• Po'ipu Beach (4 hours, free)
• Blue Hawaiian Helicopters (1 hour, $309)
• Halele'a Spa (2 hours, $400)
• Wailua River State Park (4 hours, $45)
• Luau Kalamaku (3 hours, $139)
• Na Pali Explorer (5 hours, $220)
• Limahuli Garden and Preserve (3 hours, $20)
• Upper Waikani Falls (2 hours, free)
• Total Estimated Costs - $1133 per person

Transportation:

It is best to rent a car to get around the island, as public transportation is scarce. The average cost of car rental is $50-$70 per day. Taxis and ride-hailing apps are also available but can be costly. The roads in Kaua'i can be winding and narrow, so remember to drive with caution.

Useful Tips:

Add: Take a sunrise hike to the Kalalau Lookout for a breathtaking view.
Subtract: Remove one activity from Day 2 or Day 3 for a more relaxing pace on the honeymoon.

Airports

Kaua'i's main airport is Lihue Airport (LIH), located in Lihue, which is approximately 3 miles from the city center. LIH serves direct flights from the US mainland and neighboring Hawaiian islands.