After watching of an unhealthy majority of the shows this season (or at least part of them), I am sure of a few things:

The following shows will have a beach/pool and a hot springs episode:
Rio – Rainbow Gate (but they’ll take place in the prison… erm, the casino)
Infinite Stratos
Freezing
Onii-chan
Kore wa Zombie

The following shows will have a beach/pool episode:
Yumekui Merry
Puella Magi Madoka Magica
Gosick
Beezlebub
Dragon Crisis
Fractale (above image counts as beach, right? Right?)

Alas, shows that won’t have either:
Kimi ni Todoke Season 2
Level E
Wandering Son

That is all.  (I’ll probably be wrong but whatever.  First impressions are always fun.)