Taketomi Island is located at latitude 24°N and longitude 80°E, a part of the southernmost Yaeyama Archipelago. Ishigaki Island is 470 km away from Naha, Okinawa.

To reach it you can fly or take a ferry to Ishigaki Island, the hub of Yaeyama
Archipelago and take taxi or bus from Ishigaki Airport to Ritosanbashi.
From Ishigaki Harbor to Taketomi Island takes about 10 minutes, to
Kohama Island and Kuroshima about 25 minutes, to Iriomote Island
about 40 minutes, and to Hateruma Island
about 60 minutes by boat.

By Airplain to Ishigaki Island
*approximate travel time

from Tokyo 3 hours 10 minutes
from Nagoya 2 hours 45 minutes
from Osaka 2 hours 40 minutes
from Fukuoka 2 hours
from Naha 45 minutes
JAL
JTA
ANA
AIR NIPPON

The boat from Ishigaki Island to Taketomi Island
takes about 10 minutes
Time table
1: http://aneikankou.co.jp/liner/taketomijima.html
2: http://www.ishigaki-dream.co.jp/move.html
*Above websites are available only in Japanese.