Last time, they went to a beach. This time, they go to an island (Izu Ooshima), and also bring Kataoka Azusa (voice of Nagisa). They feed some squirrels, eat "alien shrimp" (Japanese spiny lobster), climb a mountain, soak in a hot spring, buy souvenirs, and barely make the return flight, err, boat. The boat is likely turbine powered anyway.
For a radio CD, it's not as exciting as the above paragraph might sound. Oh well. Apparently, Azucchi was seasick the whole time. They really should've stayed overnight. Unfortunately, I'm sure they had a tight budget. There aren't very many people like me who buy radio CDs after all. It's a shame, really.
