An underwater base (not a good first shelter.).A dugout (When making it, you will gain and not use blocks, unless you run into an opening that you want to block off.).A walled off area (Even if there is no ceiling, it will still let you sleep if it's closed off).
A larger fort or castle (a collection of buildings, sometimes arranged around a courtyard.A small dirt shack (Good for the first night).8.3 Zen Garden (can be seen indoors sometimes).7.19 Make another base in a new location.7.18 Remake it out of a different material.7.15 Add above-ground floors to your shelter.7.14 Add underground floors to your shelter.