Garamsythe Waterway is huge because they have to spare some place for (SPOILER)CuChulainn, but you can't access it now *Laugh*.
When you're in Estersand, do you not realises a wild dinosaur, avoid them. Remember, you only travel through the small portion of the Estersand, you can access more of it later, some be sure to come back when you're level 30.
Don't even think of going deeper (There's entite and Dive Talon) to the Westersand, at least be at level 30.
Lastly, now that you have Fran and Balthier, go and hunt Thextera in Westersand (It's not located deep within the Westersand).
'Amalia' is nice, btw.