Cancun SEAWEED Problem 2022: Everything You Need To Know.. Cancun is undoubtedly the most popular tourist destination in Mexico. With its beautiful powdery white sand beaches, turquoise water, wild nightlife, affordable all-inclusive packages, and great shopping scene, Cancun attracts millions of tourists every year.. However, Sargassum has been a major problem for Cancun for the past few years along with other popular tourist destinations like Tulum and Playa del Carmen..