Unstable SMP Public is a Minecraft server built around Survival, SMP, PvP, and Vanilla gameplay, with a roleplay side to go along with it. The world is fully set up for the Unstable SMP experience, so you can jump in, explore, and get involved with the community right away.
There are character role applications if you want to get more into the roleplay part, plus loot drops, staff applications, and events to keep things moving. It has that public SMP feel, but with enough extra bits to make it more than just a plain vanilla survival server.
If you like open-ended survival with a bit of PvP and community-driven roleplay, this server is aiming for that style. The features are simple, but they give players a reason to stick around and take part in what is happening in-game.