This project allows your students to incorporate the R. 3 Ch.7 supernatural vocabulary AND the subjunctive with doubt, all at the same time! In pairs, students debate the existence of various mysterious beings and places (it gives them a list to choose from.. El Yeti, los extraterrestres, Atlantida, etc.). One side argues in favor of the existence of said creature, and one side argues against it. Under "requirements," it asks them to use specific subjunctive trigger phrases when presenting their arguments. This way, they are speaking, using the vocab, and employing the grammar all at once! It is a lively project that the students really enjoy.
I usually spend one week on this project - three days in the lab/library for research, one day in class to put it all together and rehearse, and one day for presentations. You can even give the class (audience) a little score sheet and have them determine which side won each debate.