nice Budget Resort on Cenang Beach, RM 100 - RM 230 (Chalets). They also have really lovely treetop chalets (RM180, RM230) but you need to book in advance to get them, on-site indian restaurant
The main town on Langkawi and the place you arrive per boat from Penang, Kuala Kedah or Kuala Perlis or from Thailand.
Datai Beach, Langkawi
Langkawis most exclusiv beach in the north-west of the island. Home to the super-exclusiv Datai and Andaman Resorts