I would actually disagree about Atamara. Atamara is the "plain vanilla" island, really. It has no special features. If you want a monster heavy island, go to Dwilight. Or go to BT and start tossing around some scrolls. Monster spawns won't help Atamara. The big realms will barely notice, and the small realms will get 1-2-punched by the monsters and the MiCE.