Yeah, they're tricky to find there. It took me a while to find them their too.
The Prize Pods are hiding in the Skull Rock thing. When you take the boat and land on Skull Rock go to the very end (don't go inside) and you'll find some rocks to jump up on. keep jumping up and you'll eventually find an enterance. Once you're inside go to the edge of the cliff and keep siding until you get to another cliff ahead of you and that'll lead you out side again and that's the area where the Prize Pods hide.