Let me know if I should spoiler tag this stuff, but I don't see the reason. Nobody else is watching and it is Sailor Moon, where spoilers don't matter all too much. Or, like, at all.
Usagi thinks that Talks-With-Turtles is Tuxedo Mask, and she's nice to him and his turtle, so he invites her along to an amusement park. Usagi comes with Makoto and Rei, while Motoki brings the real Tuxedo Mask and some poor devil who ends up stuck with Rei who is so scared of her he just gets hiccups all the time. He says that always happens when he's close to girls, but no, I'm pretty sure he's just scared of her.
Who wouldn't be. This Rei looks like a psycho killer on a good day, much less on one where she gets duped into a triple date with Usagi without even knowing beforehand.
They're also renting row boats and while Hiccups and Talks-With-Turtles are trying their best to row, Makoto is just blazing past them. Mamoru is rightly impressed and asks if he should help, and she's like, yeah no, I got this. Yeah, that elicited laughter. Talks-With-Turtles sees turtles and is happy, Usagi is confused why Talks-With-Turtles isn't as exciting as Tuxedo Mask and generally, this is a pretty good episode.
The four get lost in a house of mirrors (that is mostly plastic because they could not afford mirrors) and trade places, and the set up is really cheesy and reminds me an awful lot of Seiya and Usagi in Stars... although there it was not a house of mirrors but a haunted hourse, of course. Anyway, #teamseiya now and forevermore. Rei sees a Youma and runs off, and of course she does, because otherwise this would not be Sailor Moon.
Poor hiccups blames himself. Poor guy. He gets possesed by the Youma and drains Rei's energy, which makes his turtle rise. I mean, the turtle backpack he's carrying, because Hiccups is a turtle lover too. I... wow. This is the worst joke in the history of all things Sailor Moon (Episode 7, at 16:40, if anyone wants to check, or maybe make a gif out of it...).
Usagi transforms in the house of mirrors because she thinks Mamoru can't see her transform, Makoto and Usagi pummel the Youma, Jadeite tries to fight them but Tuxedo Mask shows up. Usagi tells the girls she thought Motoki is Tuxedo Mask, Rei is really, really annoyed about being dragged into something this stupid because of Usagi's emotions, and Makoto defends Usagi, and the next episode is apparently about Makoto and Rei fighting, which in this context makes a whole lot more sense than Makoto and Minako going at each other in SuperS.
Minako was in the episode for two scenes and she's really weird.
I, uh, might not be entirely objective, but Makoto's actress kills the role. Usagi has the unenviable task of trying to be Usagi, which on and off works, Rei is... more manga Rei than anime Rei and Ami wasn't even in the episode because, uh, a second extra would have cost money?