Two kilometres of island, three beaches, no cars. The choice is genuinely simple here — which is part of the appeal.
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Koh Lipe is about two kilometres long, sits at the far southern end of the Andaman coast inside a national marine park, and has no cars at all. A pedestrian lane called Walking Street crosses the middle of it, linking the two main beaches, and the whole island can be walked end to end in half an hour.

That changes how you choose. On a big island the beach decides your holiday; here it mostly decides your view and your walk to dinner. There is a national park fee on arrival, boats anchor off the beach rather than at a pier, and you wade the last few metres — pack accordingly.
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Pattaya Beach on the south side is where the speedboats arrive, and where most of the island's rooms, bars and restaurants are. It has the widest choice at every price, the shortest walk to anything, and the most life after dark.
It is also where the boats park, which means engine noise by day and the busiest stretch of sand. If you want to be in the middle of things it is the obvious choice, and Walking Street starts at its eastern end, so the rest of the island stays within easy reach.

Sunrise Beach on the east is the longest beach on the island: a wide strip of white sand looking straight across to the green wall of Koh Adang. It is calmer than Pattaya, has good swimming and a handful of restaurants, and it is where most people wish they had booked.
Sunset Beach in the north-west is the smallest and quietest of the three, with only a few places to stay and a short walk over the middle of the island to the shops. It is the one to pick if you want the island at its most peaceful — and, as the name promises, the sunsets.

Sunrise Beach for most people: the longest sand, the best swimming and a real view, with Walking Street ten minutes away when you want a restaurant.
Yes. It is small, walkable, has no traffic and the water is shallow and clear — a rare combination. Sunrise Beach suits families best.
No. You can walk between all three beaches in well under half an hour. Motorbike sidecars exist for luggage and for the far ends.
More than the mainland, because everything arrives by boat. Rooms and food cost noticeably more than on Koh Lanta or Koh Chang.
More Koh Lipe and Andaman coast guides, plus the rest of Thailand's islands.