Project Based Learning is not something you DO, it's something you ARE. If your philosophy is that students should sit in custodial rows (so the broom or vacuum will fit between the rows) and do worksheets all day, then you probably don't understand PBL.
PBL requires finding a real world problem and then allowing students to incorporate all of the things that we have taught them to date while researching an answer. When students come up with the problem themselves, the whole experience is far more authentic.
Why authentic learning? Because students (and teachers, too!) get engaged when trying to solve a problem together. Teamwork. Conversation. Research. Writing. Listening. Speaking. Technology. Planning. Could your students use some of those things?
Let's not just teach ABOUT something. Let's teach THROUGH something.