Sanur Beach, Bali's earliest beach resort, features a relaxed coastal ambiance. Its famous for its shallow water and colorful boats. http://www.bali-indonesia.com/sanur/
Dufan or Dunia Fantasi is one big complex with the beach that I’ve talked about earlier. This is the biggest amusement park in Indonesia (probably? There is also Trans Studio Makassar and Bandung too, I have never been there so I am not really sure). Playing around for a full day in Dufan is like a short getaway from the busyness of Jakarta. I can tell that going to Dufan for some Indonesians who live on another island than Java is like a dream come true. As for me, spending one day with a bunch of friends in Dufan is definitely going to be a super fun day! Don’t go there on the weekend since it will be ridiculously busy. https://www.ancol.com/en/destination/dunia-fantasi
Ancol Dreamland is part of a huge tourism resort on the Jakarta Bay that comprises multiple amusement parks, making it a must-visit for families on holiday in the capital city. While it isn’t likely you’ll be able to experience all of the different highlights in a single day, each entertainment feature are destinations on their own. The park was home to Indonesia’s own Sea World until 2014, but continues to attract crowds to its ‘Fantasy World’, full of endless thrill rides.
Considered the largest of its kind in Southeast Asia, the Ancol Dreamland tourism resort also features an international championship golf course, a hotel resort and Ocean Dream Samudra. The latter serves as an edutainment marine theme park much in place of the closed Sea World, featuring eight different regular shows including a dolphin show, together with saltwater and freshwater aquariums and even an adjoining bird park. http://www.indonesia-holidays.com/jakarta/attractions/ancol-dreamland.htm
This Museum holds the collection of maritime artefacts collected from throughout the Indonesian archipelago from Sumatra to Papua. It has traditional and modern boats with all the necessary gear and equipments, the different kinds of underwater life available, the large variety of fish, Indonesia’s maritime heroes, a collection on the history of the Indonesian Navy, and the KPM shipping between Batavia-Amsterdam. http://jakarta-tourism.go.id/2015/content/maritime-museum