Trincomalee is a city in Sri Lanka. Trincomalee has a very nice beach even during the summer.
A snorkelling trip to Pigeon Island is a must. There are local boats that will take you to this island for a fee of about US$30 (return). Snorkelling is a great way to see the abundant sea life. Sadly the coral is not respected by the locals. Snorkelling should be done with great caution as some areas are very deep, up to a thousand metres in depth.