In short
- Book an open-air boat tour for a guided ride with no physical effort.
- Rent a kayak to paddle yourself and tie up at the cave landing.
- Plan for 1 to 2 hours to visit the historical site.
In this article
The Fern Grotto is a natural lava-rock cave covered in draping ferns. Because it sits upstream on the Wailua River, you cannot drive or walk to it. You must travel by water to see this historic site.
How do you get to the Fern Grotto?
You access the Fern Grotto by taking a boat up the Wailua River.
You have two main options to get there. You can book a seat on a motorized open-air boat tour, or you can rent a kayak to paddle yourself. The site is accessible only from the water.
What is a Fern Grotto boat tour?
A boat tour is a motorized cruise that takes you directly to the cave landing without any physical exertion.
Smith's Kauai has operated open-air motorized boat tours to the site since 1946. These boats navigate the river safely while you sit back. The tour often includes live Hawaiian music inside the acoustic cave. This cave was once strictly reserved for Hawaiian royalty.
Can you kayak to the Fern Grotto?
Yes, you can rent a kayak or stand-up paddleboard and paddle to the site.
If you prefer an active trip, you can paddle up the Wailua River yourself. Once you reach the site, you simply tie up your kayak at the designated landing. When paddling, stay on the north side of the bank. This rule helps you avoid collisions with large motorized tour boats.
Should you choose a boat tour or a kayak rental?
Choose a boat tour for an easy ride, or choose a kayak for an active, self-guided trip.
Motorized tours are the easiest way to see the cave. Kayaks require physical effort but offer more independence on the water.
Where do tours and rentals depart?
Access points are located at the Wailua River Marina and the state park boat ramp.
You will drive to the marina area just off Kuhio Highway (Highway 56). This spot is about 15 minutes north of Lihue Airport. Parking is free. Arrive before 10:00 AM to easily secure a parking spot in the marina lots.
How long does a visit take?
Visiting the Fern Grotto typically takes 1 to 2 hours.
The exact time depends on your mode of transport. A motorized boat tour follows a set schedule. If you kayak, your trip time depends on your paddling speed and how long you stay at the cave.
Questions travellers ask
Can you paddleboard on the Wailua River?
Yes, you can rent a stand-up paddleboard to navigate the river. You can use it to reach sites like the Fern Grotto.
Is there an entrance fee for Wailua River State Park?
No, entry and parking at Wailua River State Park are completely free. You only pay for boat tours or kayak rentals.
How do you get to the Fern Grotto?
You must travel by water. You can book a motorized open-air boat tour or rent a kayak and paddle to the landing.
