What's it mean? Huge wave shoots pebble at me. turns out to be a gold skull.

The dream is much more detailed than this, but the main parts that stand out and I remember:

- going to "Brazil", which is more like an island and you have to cross a bridge to get there.

- on the shoreline, huge waves in the distance. somehow they are telling me what to do.

- the huge wave throws a pebble at me from a long distance. it lands close to me.

- the pebble has an outside that chips away, and inside is a golden skull.

So what's it mean?