Thank you for your feedback! We are glad to hear you enjoyed your overall tour experience. Although many of our tour operators employ multi-lingual guides, this particular tour supplier unfortunately does not currently offer a Japanese-speaking tour guide. Additionally, it is always recommend that all valuables are secured prior to the adventure to ensure they are not damaged or lost. Our tour guides have dived down where you reported your camera was dropped into the river at no additional cost to you, but unfortunately they have not be able to locate your camera. We appreciate you booking with us and wish you Happy Travels for the future!