>>52758103I actually like the Sevii Islands. It's true that they're not amazing, so they are a bit lackluster for postgame material, but they make for a fun side area.
One Island:
>comfy small island town with a volcano and hot springsTwo Island
>special move teacherThree Island
>another cute small town>Dunsparce tunnel>creepy Hypno bsFour Island
>Daycare>fun quest with LoreleiFive Island
>Team Rocket shenanigans>Togepi>Some fun world stuff - a resort and the boy's deceased OnixSix Island
>cool design>pattern bush is a great joke - a cartridge-shaped maze full of bugs>sadly broken Altering Cave - thanks GFSeven Island
>Battle Tower>Tanoby RuinsWhile it would have been nice to have a more robust postgame area (expanding the Sevii Islands could have worked, Johto is the obvious one, and even the Orange Islands might have been fun).