Nami: "This, THIS is the ship we're gonna travel on! This is the smallest boat I've ever seen! How the hell are we gonna make it to the Grand Line with this!"

Luffy: "Hey! All pirate adventures start from somewhere! I'm sure we'll find a bigger ship to sail eventually."

Zoro: "Hey as long as I get lots of booze and achieve my goal, this is alright with me."

They were all bickering about the ship and their journey. Luffy wanted to become King of the Pirates, and it all starts here in the East Blue.