Sentence:  From the ground, Colombo's port does not look like much. Those entering it are greeted by wire fences, walls dating back to colonial times and security posts. For mariners leaving the port after lonely <WSD>nights</WSD> on the high seas, the delights of the B52 Night Club and Stallion Pub lie a stumble away. 
Meaning of the word marked with <WSD> tags:  An evening or night spent at a particular activity.