1. Skip Sunday in Your Itinerary: The constitution mandates a nationwide shutdown on Sundays—shops are closed, flights and ferries do not operate. Avoid scheduling inter-island trips, shopping, or ATM withdrawals. Just enjoy a quiet day.
2. Book Whale Watching Early: During the peak season from July to October, licensed operators fill up quickly. Book 2–3 months in advance. While in the water, always follow your guide’s instructions. Do not touch or chase mother-calf pairs.
3. Visa-Free Entry & Transit: Most foreign visitors enjoy 30-day visa-free entry. Check transit requirements if connecting through Fiji or New Zealand, and have your return or onward ticket ready for inspection.
4. Carry Enough Cash: ATMs are scarce on outer islands, and card payments are uncommon. Bring small denominations of Tongan Pa’anga. Whale watching and overnight boat trips often require cash payment.
5. Embrace Tongan Time: Delays of an hour or two are cultural, not rude. Keep your schedule flexible, and avoid rushing others—it can be awkward.
6. Respect the Royal Family and Church: Avoid public discussions about the royal family. Keep noise levels down in churches and on Sundays. When entering a church, remove your hat and dress modestly (shoulders and knees covered).
7. Drive on the Right: Unlike most neighboring Pacific island nations, Tonga drives on the right. At roundabouts, yield to traffic entering from the right. Drive at night only when necessary.
8. Watch the Tides at the Blowholes: The blowholes are most spectacular—and dangerous—during high tide. Always stay behind protective barriers, and avoid getting close to the reefs during peak high tide.
9. Mosquito and Sun Protection: Dengue fever and strong UV rays are both concerns. Reapply mosquito repellent and high-SPF sunscreen daily. Wear long pants when exploring rainforest areas.
10. Emergency Numbers: Police – 922, Ambulance – 933, Fire – 999. For serious medical needs, evacuation to Fiji or New Zealand is usually required. Check that your travel insurance covers medical repatriation.

Final tip: Whale watching is the highlight of any trip to Tonga. Set aside both your budget and patience for it—book a second day if the first doesn’t go well. And on the Kingdom’s soil, a simple “Malo” (thank you) and respect for Sundays will earn you more goodwill among locals than any guidebook ever could.