4-person taxi in Okinawa with 2 kids?

I have a family trip to Okinawa in Summer holiday. We have 3 adults and two childs (7 and 10 years old).

I know that there is a larger taxi in Okinawa which can carry 5 persons.

1) May I know is it easy to find? or need to reserve it eariler?
2) Will the normal size (for 4 persons) accept me?
3) I will visit some popular places such as aquarium, american village, etc. Do I need to reserve the taxi?


Thank you.

p.s. I have two middle-size luggages.

No you cannot use a 4 person taxi for 5 people.

Use two taxis.

I honestly think you need to have a good look at a map to understand the size of Okinawa.

For example - it takes around 2 hours to DRIVE directly to the Aquarium. Think how much that will cost to do in a taxi.

Due to the fact that Okinawa is quite large and outside of Naha is can be sparsely populated, finding larger taxis will be a rarity.

Public Transportation is affordable
Okinawa Yui monorail 1 day pass=800 yen
2 day pass=1400 yen
Yui monorail and naha bus 1 day=1000 yen
Naha bus and ryukyu bus 1 day=2000 yen
Naha bus 1 day,valid only naha city=660 yen

Just take the monorail to the city, possibly where your hotel is, from the airport​.
https://www.naha-airport.co.jp/en/access/monorail/

Take buses to many places including the aquarium. Or, join a local tour from the Naha bus terminal.