Warning: A photo-heavy post ahead (avoid using Data!!!)
If you've read my previous post on how to get to Disneysea then you definitely know that you should get to the entrance ahead of opening hours too!
In order to take the rides efficiently, (most rides out of hours spent at park) you have to plan!
Having NEVER been to Disneyland/sea before or Japan for that matter, I had no idea the scale of the park or the amount of people. If you're confident enough, I would encourage you to split up for Fastpassing and meeting up later at a fixed location. Remember to set a back-up plan to meet if you miss a time and place! (Most Airbnb hosts provide a pocket wifi, make sure it's charged because you'll surely need it).
More details after the jump!