In short
- Kayaks are banned from the Fern Grotto landing.
- Kayak rentals cost $75 to $105 and are prohibited on weekends.
- Most kayakers paddle to the Secret Falls trail instead.
In this article
Many visitors want to combine a paddle up Hawaii's only navigable river with a visit to the famous lava rock cave. While you cannot dock your kayak at the grotto itself, the Wailua River still offers miles of water to explore and alternate jungle hikes.
Can you kayak to the Fern Grotto?
No, independent kayakers cannot stop at or enter the Fern Grotto.
Wailua River State Park strictly prohibits any individual kayakers from accessing the Fern Grotto landing. To see the grotto, you must book a ticket on the commercial riverboat. Kayakers paddling up the river will pass the grotto area but are not allowed to dock there.
How much does it cost to rent a kayak on the Wailua River?
Kayak rentals typically cost $75 to $105, depending on the outfitter.
You can rent single or double kayaks directly at the Wailua River Marina. The paddle takes about 45 to 60 minutes each way. Local laws prohibit weekend kayak rentals on the river, so you must plan your trip between Monday and Friday. You must also pay the $5 per person entry fee and $10 vehicle parking fee via credit card if you are a non-Hawaii resident.
Where can you go kayaking on the Wailua River instead?
Most kayakers paddle to the Secret Falls Trailhead to hike to Uluwehi (Secret) Falls.
Since the grotto is off-limits to paddlers, the primary destination is the muddy pull-off for Secret Falls. After tying up your kayak, the hike takes one to 2 hours and involves crossing streams. You will need water shoes with good grip. The boat trip and hike combined take most of the day.
Should I book a guided kayak tour or go independently?
Guided tours handle logistics and state park fees, while independent rentals offer flexibility.
A guided tour includes your kayak, dry bags, snacks, and a local guide. Tours often cover the state park parking fees, which saves you a step at the marina. If you rent independently, you must manage your own car transport, parking fees, and river navigation.
| Feature | Independent Rental | Guided Tour |
|---|---|---|
| Cost | $75-$105 plus park fees | From $95.71 |
| Parking Fees | You pay ($10/vehicle) | Included |
| Guide | None | State Certified Guide |
| Snacks | Bring your own | Included |
What should I pack for kayaking Wailua River?
Pack a dry bag, reef-safe bug repellent, and a light rain jacket.
Brief tropical rain is common on the river. Bring sunscreen and a hat for the open water, plus a reusable water bottle. If you plan to hike to Secret Falls, wear clothes you do not mind getting muddy. Bring a credit card to pay the state park fees at the marina.
Questions travellers ask
How long does it take to kayak the Wailua River?
Paddling upstream takes 45 to 60 minutes each way. The duration depends on your pace and the river currents.
Can you walk inside the Fern Grotto?
No. Since rockfalls occurred in 2006, visitors can no longer enter the cave itself. You must view it from a designated observation deck.
Are reservations required for kayak rentals?
Yes, outfitters recommend making reservations in advance because rentals frequently sell out. Remember that rentals are unavailable on weekends by law.
