Seafood Restaurant
In your dramatic play area set up a seafood restaurant complete with menus,
plastic food, and play money. They can pretend to be waiters and waitresses.
Remind your children to order healthy food. 
Sea Creature Cookies
Make cookies in the shape of sea creatures (fish, star fish, sea horses, etc)
Hidden Treasure
Get a small bucket or trough and fill it partially with water, fill this trough
with seaweed or other sea vegetation. Hide small treasures on the bottom of
the trough and let your children search for these items. Warning: This is very
messy and fun!
Seashell Sand
Add seashells to your sand table for a great beach feel. 
Beach Towel Day
Let the children bring in a beach blanket during beach week. They can take naps
on them are sit on them during activity time.