When designing the syllabus for the course, decide whether you want to stick to the syllabus or have the option to veer throughout the semester. Allot extra time or even entire classes to delve deeper into certain areas. Sometimes students get drawn into specific areas, and instead of plowing ahead to the next topic and losing an opportunity to keep the students engaged, allow for time to probe deeper into certain areas, which can keep you more engaged as well.
Students don't learn as much while sitting passively during a lecture as they do when they're discussing subjects, writing reflectively and relating it to past experiences. The key to getting new information into long-term memory is to make the information meaningful. Having the students find ways to make it important to them personally also keeps them more engaged because the information actually relates to their lives. Use a threaded discussion board for students to ask questions and respond to you and other students, and clearly express your expectations from their responses.
Computer programs and new technology need to be used as tools, not as a substitute for good teaching. Use PowerPoint presentations and computer-generated 3D modeling as ways to bring your lesson plans to life. Present visuals to engage students and give them different perspectives on various subjects. Researching and familiarizing yourself with new technology will not only keep you current and fresh, but it can also help boost your level of interest by giving you a new way to look at your lesson plan.
Teaching is a science, but it's also an art. Experiment with different styles and strategies to find what works best for you and the students. Stale lesson plans might have worked in the past, but it doesn't mean they'll always succeed. Get feedback from students frequently. Have them explain what they've learned at the end of class or the beginning of the next one to see if your methods are maximizing learning and comprehension. While you or the school might not appreciate an entire semester of experimentation at the students' expense, try to find small ways to improve daily. Converse with other instructors to find new techniques or ways they've succeeded with particular students.