Diocletian’s Palace is the city's pride and glory, as it houses the alleys and squares that compose the Old Town. Built for the Emperor Diocletian back in the 4th century CE, it boasts an impressive figure and a well-preserved building. As you walk through the Bronze Gate, a stunning view of the Palace will be disclosed to the eyes, revealing the magnificent ancient fortress. The ancient fortress is not just a dusty monument. It has become a vibrant neighbourhood with many shops, cafes and restaurants, as well as some apartments. Around 3,000 people live on the territory of Diocletian's palace today. In the popular HBO show Game of Thrones, Diocletian’s Palace doubles as the city of Meereen.

The original Botanical Gardens were established in 1855 and were located on Alice Street on the south-east side of the city. Due to the proximity to the river, the gardens have been flooded eight times which lead to the new botanical gardens at Mount Coot-tha. Don't miss the Tropical Display Dome — a large geodesic dome.

Downtown (El Centro) is the actual backbone of Cancún. What it lacks in history, it makes up for being a true melting pot — an exciting mix of the old traditional Mexico and an ultra-modern urban sprawl. Avenida Tulum, the main street, passing through the heart of the city, is easy to reach by public transport. The street is lined with shops, cafés, bars, and restaurants. Be sure to stop by Parque de las Palapas, on the market square, where locals come to chat and watch the entertainment provided by various local groups. The lively atmosphere and the sound of Mexican music are infectious, and any worries will quickly be postponed to "mañana." Browse around the artisan stalls and try some of the local sweet delicacies or visit the "Hippie Market" around the corner. In the evenings, the place to be is Avenida Yaxchillan with its lively restaurants and bars, popular with locals and tourists alike.