Kasai Rinkai Park is one of the largest parks in Tokyo and I really recommend its aquarium and the biggest ferris wheel in Tokyo there. The park has: lawns, walking trails, an aquarium, and a ferris wheel which is biggest in Tokyo.
Access: Kasai Rinkai Kouen Station by JR Keiyo-line. (next to Disney resort station)
more info of the park
Why we love this aquarium is that you can get to see bluefin TUNA tank!!!! it is sooo amazing……
And the entrance fee is cheapest (adult: 700yen, children under 12 years old: free!!) that I know but there are so many kinds of fish and water tank. You’ll need more than 1 hour to see all the exhibitions if you are with kids because there are lots of feel and touch and quizzes and small exhibitions that children love. You may want to bring your own lunch because its food court serves expensive food….(not so yummy) but Trust me, this is the best aquarium in Tokyo.
Sharks and all other funs, small exhibitions for children.
Outside the aquarium, this is the way to go to seaside (they have artificial beaches that you can swim in summer) and a cool observatory, from there you can see Tokyo Disney Resort and Yokohama across the sea, even Mt. FUJI (may be winter time only).