Let's go to the sea! I love the ocean - I recently did a video on my facebook site - @ofortunaorff with the ocean in the background while I sang a beach song and used cockle shells!
This is a lovely song from Guatemala and has a rhythm activity where small groups create rhythms using ocean animals. You can choose to have the students create the contrasting sections in Spanish or English and there are four different "sets" of rhythmic building blocks - colored, black and white, with rhythms, and without.
Consider adding ocean drums and rainsticks. This is also a good one for ukulele - F and C7!
Email me for the full pdf - email@example.com.
Now make plans to go to the beach!