Hi Olivia, Glad you're enjoying yourself.If you think it's hot now, just wait for the Amazon and Manaus.
We did this 2 years ago and really enjoyed it.
In Manaus I took the "Meeting of the Waters" tour and really enjoyed it. Those giant lily-pads are something else.
Poor Ray took the "Jungle Trek" and was very dissapointed in it. It teemed rain....he was covered in mud...the only animal he saw was when they "found" a cobra off the path.
So the next day he took a taxi to the local zoo.
Don't think we did anything in Fortaleza, been there before...too hot to do that much.
Continue to have a great time.