Tsunami is an interesting place because of it's variety. As a
player there are any number of thing you can do, from your
casual hack and slash xping, pking, questing, warring (where
the MUD reboots into a large arena where players get the
chance to kill each other without losing xp).
There are also invasions, where evil npcs attack the mud and the
players must unite to stop them. Some of the economy is player
driven, so if the life of a merchant is for you, then you can set
up a shop and sell heals, items, or alcohol (slower, cheaper heals).
The place is pretty newbie friendly, a good place to start a
mudding career or to continue one. There are a few people who
might give you a hard time, but there are more who are willing to
help with eq, ideas for places to xp, and what race/class
combinations work. There are alot of classes and races to
choose from, so whatever you feel like playing, chances are
tsunami has something that, at the very least, is similar to what
you're looking for.
It's a fun place, check it out and it won't disappoint.