The elephant and wildlife sanctuary would definitely be interesting to me and for most children I bet. However, before taking a child to a place where animals have been injured and are being rehabilitated, or where animals are caged or fenced in you should consider how this might affect the child.
I took my children and some of their friends to the zoo when they were younger. Most of the children had a good time watching the animals. However, there was one little girl who did nothing but cry, and she wouldn't tell us why she was crying.
The little girl's mother told me the next day that her daughter had told her that she was crying because she felt so sad for the animals because they were so far from their homes and they had to be fenced in so they couldn't go back home.