The straw hats were simply sailing the seas,nothing more.

They were going to a supposed island called Morioh,where supposedly,there were various things they seek

Zoro was seeking for another sword just to test. Luffy was seeking for food,obviously. Nami was obviously seeking for treasures,money,and valuable things. Chopper was seeking for a herb known for being a very good antidote for most things. Robin for one of those stones only she can read. And Usopp for some materials for bullets