てゐは永遠亭の皆にナイショで海へ行きました。／永遠亭の風呂はでかいです。／姫様は指輪型の水鉄砲で遊んでらっしゃいます

Tewi kept it a secret from everyone at Eientei that she went to the beach. / Eientei's bath is huge. / Her Highness is cavorting with a ring-shaped water pistol. Yes, "cavorting". The original uses a very formal verb ending.