For an interesting overview of these places, visit Trincomalee in Legend and History. They were interesting. We were gone over two hours and about 25 kilometers.
Upon returning, we walked up our beach to a river. It blocked our further progress, so we turned around. It's very hard to distinguish distance when walking on a long beach, but the GPS comes in handy at these times. All meals end up being at the hotel as it's convenient and reasonably priced. I took another nap. Quite the life, eh?