I didn’t get any nice, or even instructive, pictures from the lighthouse (except I like the one of the basilica) and neither did the internet because I couldn’t find even one to take, so here’s a map of the colonial old town. The locations in red are my hotel, the basilica, and the lighthouse.
The population in Colonia is a few thousand more than that of Trinidad, small, but it appears much bigger because of all the visitors.