Toontown is free to play and try...you can have a free membership but it limits you to one land but you can still do all the activities like trolly games, fishing and racing.
As for violence and fighting, you are getting rid of robots (Cogs) using cute things lke cream pies and squirting flowers.
The game does require some teamwork and working with others to get your tasks done.
The tasks are fairly simple to start off and can be done by pretty much anyone that is at reading level.
LOTS of adults play this game and we also have a forum similar to Dis.
It is alot of fun if you give it more than a 5 minute chance to look around go on the trolly and try a few races.

Of course nothing compares to a FREE VMK, toontown is my close second