Here is a very simple craft project that you can work on with your kids and it only takes about 10 minutes to complete.
I don't have a beach near by so I got my supplies from Micheal's. The sand actually has a slight tropical coconut thscent. I filled a mason jar a 1/4 of the way with sand and then I dropped in some shells and sand dollars. I then trimmed it with burlap and twine. I have it in my guest bathroom since it totally fits in with my shower curtain and rug. If you make more than one they can be used as centerpieces. Maybe one day my daughter will have Mermaid Party.