Wayfinder is a small 18 plus whitelisted SMP that feels really calm and cozy. It is mostly vanilla but has a few extra things that just make the world look nicer and easier to live in without changing the game too much.

The server has custom world generation so the terrain looks better but still feels like normal Minecraft. There are simple quality of life tweaks like trees that are easier to chop down multiplayer sleep concrete you can make with cauldrons AFK display mob and player heads and creepers and ghasts that do not blow up your builds. There will also be a simple shopping district at spawn.

From what I see this server is for people who like exploring and finding new places and building stuff that looks lived in. The community is meant to be relaxed and respectful. There is no pressure to grind and there are no weird gimmicks. It is just a good world with good people where you can play at your own pace.

If you want a small friendly long term world and you like mostly vanilla gameplay with a few helpful tweaks then Wayfinder SMP seems like a nice place to join.