Your den is your home in Animal Jam and you can decorate it any way that you want and if you want to acess more items for your den you can become a Club Member.
If you are already a Club Member,you can also change the style of your den.
They cost:Water Park:4000 Gems,Restaurant:4000 Gems,Treehouse:4000 Gems,Princess Castle:6000 Gems,Castle:6000 Gems,Volcano:3000 Gems and the original den you have:Small House:2000 Gems.
Many jammers have the Water Park Den and it's the perfect Den for Summer.
If you have more questions you can always send me a question anytime you want.