I promise I will post the recipe for the actual cake soon! However, I was most excited about making the candy "sea glass", shells (white candy melts poured into molds and decorated with dark chocolate accents) and "sand" (Nilla wafers pulsed in the food processor).
I got the sea glass idea from here (another awesome Pinterest find!):
http://thekidcancook.blogspot.com/2011/05/cooking-up-party-sea-glass-candy.html
http://thekidcancook.blogspot.com/2011/05/cooking-up-party-sea-glass-candy.html
The technique is pretty easy but it takes a long time and you ABSOLUTELY need a candy (or digital cooking) thermometer.
Overall, the cake turned out pretty much exactly the way I envisioned with minimal drama! Yay!