Antigua is UNESCO site it's just very quaint and nice to walk around, coffee is big and there many cute little coffee shops beside one of the coolest starbucks anywhere. Theres a micro brewery, Jade Museum where you can see them cutting stone, an authentic marketplace where you can find cool produce and a nearby indoor art market where you can bargain for homemade artwork and knitwear. Cerro de la cruz is a nice lookout to see the city and the 3 volcanoes Volcan de Agua, Fuego, & Acatanego. See Trip reports for more inspiration.