If your looking for an easy lesson plan for a group drumming class I recommend buckets. Bucket drumming is easy to pickup and you can easily buy 5-gallon buckets in bulk at places like Lowes or Amazon.
We can easily get different tones out of a bucket by turning the bucket upside down and hitting it with a drum stick. If we strike the bucket towards the center we get a lower pitch. If we hit the rim and the bucket simultaneously, we get a higher pitch–closer to a snare drum. Drummers call this a rim shot. Striking only the rim of the bucket is another option for the higher pitch–which might be easier for beginners.
I created a simple lesson plan with three parts that segments the students into three groups:
The pulse part can be played on the rim or on the sides of the buckets. The snare part is played utilizing rim shots and the bass part is played by striking towards the center of the bucket. Here are the parts: