A recent activity to reinforce the letter Y was Yoga. Besides applying kinesthetic learning to the Y sound (which is difficult for some kids) it's also just fun. They got to take off thier shoes (yea!) and partner up.
We used Yoga Pretzel cards, but I also love how the ones on Sew Liberated use pictures of kids doing the poses. Before I set them off on their own, we practiced the poses whole group and talked a little about how to act and breathe during yoga. That didn't prevent that giggles that came from the Yoga area, though.