Translation of nachhaltig

I do not know what to write about Belgium, so that I will write about Greece because my mother is from Athens and i have a lot of cousins there and a lot of other relatives. That is right.
Other tourists needed to check out first before others could check in. I wanted to see the ruins on the same day and booked a tour in this little jungle settlement and waited for the tour guide.
One could see the animals from a distance. There were sea lions, whales and penguins, all very far away. In the evening we went on a boat for whale watching which was a really great experience.