hi! welcome back to the game! since you're new to the update, i'll just give you a biiig overview of what's new
so for rvs (which i agree, are really cool!), each day, in your campground, you will get a special npc rv. only certain npcs appear without amiibo figure usage, such as blanca, pascal, joan, zipper t. bunny, gulliver, jingle, and saharah (there maaay be 1 or 2 more npcs i'm forgetting hehe). these npcs will cycle through your campsite, so after a few weeks of checking it, you're sure to have met all of them!

like i said before, these npcs appear without amiibo usage- meaning all other rvs you'll see in your park will only appear if you scan in either a welcome amiibo villager card, animal crossing amiibo figures, a couple non-ac amiibos (cece, felyne, ganon, viche, epona, inkwell, medli, wisp, and wolf link), or sanrio amiibo cards. these have to be bought irl, and can only be scanned in if you have a new ds or an nfc reader (which you can find on amazon). these special scan-ins will bring their rv to your park, and you can visit it and have visitors visit it (this is why, here on the forum, people often buy rv visits! that means that whoever has the amiibo figure / card scans it in and allows the buyer to visit their campsite to buy c00l $tuff. also, people can buy welcome amiibo items without having to visit the rv itself- people here also sell just the rv items for tbt or igb)! so essentially, unless you want to visit a special rv, you'll eventually get to see all the non-amiibo npc rvs in your campground eventually :') my personal favorite is joan's rv, if you've seen it yet! (if you haven't, wait just a couple days- it'll appear because she's a no-amiibo-required rv npc hehe)
you also mentioned mini games! some rvs can sell you a new nintendo 3ds or a wii u for your character (you can also get them from fortune cookies)- it's a tiny furniture item! when you put these in your house and select them, you can play a minigame called Puzzle League on the 3ds and you can play a minigame called Desert Island Escape on the wii u.
hope that helped just a bit!

if you have any more questions or if something i said was confusing (sorry sorry it's 1 am here oops), feel free to shoot me a vm!!