I made a map data for Ogasawara Islands, Tokyo, Japan, which are also called as Bonin Isoands.
The islands are located in the Pacific Ocean and only have tropical climate in Japan.
(https://simutrans-germany.com/files/upload/ogasawara.thumb2.png)
The scale is exactly 1 tile = 25 sq. m. So in Simutrans-Extended, you can play with correct scale when meters_per_tile=25 or the map size is devided by 5.
You can download this here: ogasawara25.zip (686x5432) (https://simutrans-germany.com/files/upload/ogasawara25.zip)
Try to transport goods and passengers over sea with ships or aircraft!