Before WoR

Anything I should do in the original world before going to the floating island? I don't wanna miss anything...

Get Mog's Water Rondo by going through the serpent trench. You won't be able to get it in WoR

And if you're a completionist there are a few rare monsters that you should find in the WoB as well.

Overmind - Inside the Phantom Train
Fossil Fang - Desert southeast of Kohlington, where Figaro Castle sits
Grenade - Forest west of the Veldt
Intangir - Small island on the northeastern edge of the world

Yeah done those, apart from maybe Grenade, but i'll check that out. Anything else? I might have missed some obvious stuff so anything that wont be available after the Floating Island will help.....

Mog's Water Rondo is about it. There really isn't much optional stuff in the WoB. And if you have Mog I'm assuming that you've met Lone Wolf.

yeah i have boy. actually now u mention it, what are all Mog's dance's, and where do u get them. I have 7.....

Oh, did you remember to get Atma Weapon? Not much you can do about it now if you haven't but it's worth mentioning...

Wind Song - Grasslands
Forest Suite - Woods
Desert Aria - Desert
Love Sonata - Town
Earth Blues - Mountains
Water Rondo - Underwater
Dusk Requiem - Caves
Snowman Jazz - Snowfields

http://figarocastle.homemade-websites.com/mog.php

he only has 8, and if you don't have Water Rondo then you need to get that one...
there are....
Water Rondo
Snowman Jazz
Dusk Requiem
Love Sonata
Desert Aria
Forest Suite
Wind Song
and my personal Favorite (the one I always use)
Earth Blues

THE JACKEL

Also, I hope you know about Shadow, pertaining to the floating island. So you can have him in WoR

Yeah, where are these snowfields i'm hearing so much about? not remembering any..... still haven't got that dance...

The only showfields are in the back of Narshe. You'll need to wait until the WoR to fight there though.