j etais alle dans ces iles fin 2005, voila ce que j en avais ecrit a l epoque mais desole, ce st en anglais:
The Karimun Jawa islands near
Semarang are easy to reach by a twice weekly ferry from Jepara (a short bus ride from
Semarang).
You can sleep in the main town, or even better in pulau Menjangan where there are 2 guesthouses (free transportation from the mainland if you stay there)at:
Wisma Apung (67000/77000 rps without/with bathroom, add 15000 rps per meal) or another one whose name i forgot (50000 for a room, add 11000 per meal).
There's a reef at the back of Menjangan but it was not very good, and so was the snorkeling around the island.
There's a resort that is being built on the island behind, but it will be expensive.
There's as well the Kura Kura resort on Pulau Menyawakan and it's not cheap by far...
Boat trips were pretty expensive which prevented me from exploring the archipelago since the other snorkeling spots are far, who knows if it's worth, if you get there send us an up date, it would be much appreciated!!!