A10, Hub City in MP, spawned just before first blood moon. Didn`t know anything, just loved the feeling of surviving around the creepy, ominous sounds and how much surrounded I was by zeds. This Ak-47 that I found was nothing with the few bullets that I got with it, crouching on the last floor of this part demolished brick building, but it was a start.
Oh and building base on this big, high cliff, that RNG back then generated. Used only Wood Cabin Blocks for a 2 story 5x5 shed, surrounded by dog horde. These cold chills were awesome back then. Many deaths, countless.
Or when I found a hidden in the ground minibike, in the forest biome, and got stuck, making two guys just stay few blocks away and laugh a lot before killing me and take the bike. Minibike book was the rarest thing in game back then and will always remember the feeling of finding one.