yes, then you can do the Gurgu Volcano, the Castle of Ordeals (which I recommend), the Ice Cave, the Waterfall (near Onrac).

Crescent Lake (go there next) is to the west of Melmond/Earth Cave. You will sail around teh world and end up near (hopefully) a port. Push and hold B, then press Select to see the map. It's the red dot at the bottom right. The Fire Volcano and the Ice Cave are in that area (north-westish). Onrac and the Waterfall are in the upper left corner of the map. The Castle of Ordeals is just east of Onrac and the islands that you can see on the map. (It's in the North-central area of the world.)

hopefully this helps.