Izamal is one of the easiest small cities in Yucatán to remember: almost everything in the centre is painted yellow. The colour helps, but the real force of the place is older. Maya pyramids still rise inside the town grid, and the Spanish built the Convento de San Antonio de Padua on top of a pre-Hispanic acropolis.
The result is not a ruin outside town or a colonial centre with a museum attached. Izamal's Maya, Franciscan, and modern pilgrimage layers sit on top of each other in daily life. You can climb Kinich Kakmó, walk to the convent, hear Yucatec Maya in the streets, and eat within a few blocks of both.
It works very well as a day trip from Mérida, but staying overnight gives the city a softer rhythm after the tour buses leave. Izamal is small, warm, and walkable; the pleasure is in moving slowly between yellow arcades, stone platforms, and ordinary neighbourhood streets.