Before you commit to a ferry, a fair question: why not just go to Jomtien? It's the long, flat beach on the Pattaya mainland — no boat, no pier, reachable by baht bus, taxi or even on foot from parts of town. Koh Larn asks more of you. Here's whether the island earns the extra effort.
The water — Koh Larn wins, clearly
This is the whole argument. Koh Larn's sea, especially at Samae, Tien and Nual, is in a different league to Jomtien's — clearer, cleaner, properly turquoise on a good day. Jomtien's water is fine for a paddle but isn't why anyone raves about it. If your priority is a genuinely nice swim and clear-ish water, the island is worth the boat.
Effort & access — Jomtien wins
Jomtien is flat, easy and immediate: no ferry, no pier transfer, no last-boat anxiety, loads of beachfront restaurants, and far easier for prams, wheelchairs and anyone who doesn't fancy a boat. You can go for two hours and come back. Koh Larn is a half- or full-day commitment with a boat at each end.
Vibe & crowds
Jomtien is a relaxed, spread-out city beach with a local feel. Koh Larn is a day-trip island that feels like an excursion — more of an event, but busier at its main beach and more faff to reach. Jomtien for an easy local beach afternoon; Koh Larn for a proper day out.
Who should pick which
- Want the best water and don't mind the effort → Koh Larn.
- Want easy, flat, immediate, no boat (or limited mobility, or a tiny baby) → Jomtien.
- Short on time (an hour or two) → Jomtien.
- Want a memorable day-trip 'experience' → Koh Larn.
Tip: Do both across a trip: an easy Jomtien afternoon and one proper Koh Larn day. They're different things, not rivals.
The verdict
If you only judge on water, Koh Larn wins and the ferry is worth it. If you judge on ease, Jomtien wins. Pick by what you actually want that day. If it's Koh Larn, start with how to get there.