With its old dutch colonial buildings, surrounding waterfalls, hot springs and pristine coral reefs for diving Gorontalo should be a world famous destination, however, most travellers only use it as a hub for the Togean islands. According to the local population census, 96.6% of Gorontalo residents are Muslims.
Whale Sharks, probably the one thing that the city is most famous for and the main reason why some tourists stay overnight. You can do this in Olele Marine Park, and you can snorkel in the area as well.
IMPORTANT: There used to be a prawn processing plants nearby which attracted the whale shark for feeding. The plant has closed, but the locals are feeding the whale sharks to keep them in the bay, so that it is “guaranteed” that tourists can see them all year around. This is borderline ethical, because whale sharks are supposed to be migratory animals. Secondly, tour operators and tourists alike are not educated enough on the conducts around whale shark to avoid injuring them (for a start: do not touch them, and get out of their way!). If you really want to see a whale shark, do it responsibly.