Simple, but I do enjoy this. You did well.

Aww Love this, I always smiled every now and then the whole time I was reading. Good story!

Well it's been a while since I reviewed anything, especially in the Riviera section, so let's have a look-see...

The first thing I noticed was commas, and a lot of them. Look at the first line:
"SQUIRREL!," Lina screamed happily. "Look, Fia!" She pointed towards a tree, jumping up and down excitedly like a kid.

I assume that first comma is a typo, and I'm not sure why you chose to separate the two parts of dialogue when it probably would have worked together as one, but just the overload of commas not just in that line but also later on bugs me. Maybe it's a personal thing, but I feel it would have worked better if you replaced the last comma with the word 'while'. (She pointed towards a tree while jumping up and down excitedly like a kid.) And also used semicolons every once in a while.

The second thing I noticed was that everything is in double-spaced line form, there's no paragraphing, which makes it easy for the reader to lose their place if they happen to look away while they were reading (which I did, 3 times) case in point:
"Yeah, yeah, it's over here". She tossed the bundle she was carrying towards the bonfire area. "Freshly cut from my scythe over here. Pretty useful, huh?" she held up the

huge scythe, to Fia's discontent. Fia had insisted that this was to be a normal camping trip, without any weapons or fighting. Serene argued that there might be demons,

though Fia wasn't sure that she meant that for protection or for fun.

That should all be one paragraph, not spaced out like that. I assume you copy-pasted this from a word document that was double-spaced by default or something, but I suggest reading your own works to get a feel for how a reader would experience it.

Third- details, details, details. Where is everyone looking? What sort of expression are they making? What sort of stance are they making? Are they holding anything in their hands? As it is you're basically dropping details right on us, like in the beginning when Serene enters, we don't know she's carrying firewood until they start talking about it, so it's like you're saying 'oh, and by the way, she's carrying firewood'. And a bit after that with Rose, it's like 'oh and by the way, Rose is in her human form now'.

On the flip side, I couldn't find a single spelling or grammatical error on my first run-through, no OOC-ness that I could notice except maybe a bit with Rose (I think she's a bit more mature than that, but seeing as how this is intended to be comedic, I'll forgive that) and though I generally don't much care for humor fics, it did make me chuckle at a few points, the little song at the end in particular was quite entertaining, so congrats on that.

I hope you consider my points, improve your writing, and post some more amusing fics.