Koh Samed is definitively "take your own". I have stayed there too for a couple of nights.
There is basically two distinct sides to island, one side is backpackers, 7-11's and very cheap digs, the other side is more luxurious and has decent hotels in a complex with shared pool and beach. The restaurants in the complex are very expensive, even by western standards. The internet fees are also very dear. Nevertheless the various hotels in the complex are still very good for a few days.
There is no night life on the "complex side" which comprises key hotels of Ao Prao resort, and Lima coco. There are tuk tuks to the other side of the island, slightly expensive. Ferries go direct to the complex/resort side as well as the back-packer side. Many bars in the backpacker side, Bob Marley bar most enjoyable.
Recommended for 2-3 nights.