Well, I was hoping to see another Brazilian who actually knows Rio to pitch in, but I'll try and help. This might be a long post.
Rio is really hot throughout the year, and november is spring, closing up on summer. However, I've heard that excessive air conditioning might be a problem, so bring a light jacket.
Other than the regular tourist stuff (Pão de Açúcar, Corcovado, beaches) I recommend you check out the Biblioteca Nacional (National Library). It's huge and beautiful and one of the places I really want to visit when I get a chance to go there. Other than that, I found some websites for you:
http://www.cookinrio.com/
http://www.culturalrio.com.br/roteirosIngles.htm
I believe that last one has a lot of tips of stuff to do. Even if you don't do them with that specific company, you can research those on Google.
Rio has a very rich historical background, if you would like to explore that. It also has a lot of nature all around it and tons of cultural activities.
One thing you should know is that most Brazilians are happy to help foreigners who come here. So you can always ask around at your hotel, or try to start a conversation with a local at a restaurant or a beach or something. Of course, like with all things, take care of your safety and don't talk to people you don't get a good 'vibe' from (hope you know what I mean by this).
Hope you have a nice trip!