Wasn't really in this part before but now, this is how you should do it.
Check in in the Inn, put on the Kimono (Wardrobe near Yuuka's bed), Disrobe Kimono in the entrance to the Public Bath House (Door North of the Innkeeper), take a bath in the Public Bathhouse, don't put on the Kimono, Relax, then Sleep Naked. (Being able to go out of the Public Bath House's dressing room naked depends on the progression of this H-Scene).
This is the Bathhouse part which I was confused with too. Should have named this Outdoor Bathhouse instead. (Since both this one and the Public and Private Bathhouse in the 2nd Floor can be confused with).
Also there are H-Scenes you can do with Yuuka walking naked at night (Same steps as above but don't relax and just go outside) which as said as the Hooded Man in the Portal Room to the Stages, aren't in the Recollection Room.
Yeah, some of them seems like they can overlap with each other, like I was going out at night as Yuuka, entered the Tent at the Residential District, and triggered her scene with the Man in there, which is supposedly be viewed with the MC.. Also your character becomes the MC's but is still actually Yuuka's.