The Entertainment area is available when you've achieved Star Level 3 in MySims DS. Notable locations are the Casino and the Disco, which both are open during the night. Elizabeth's pet's mansion is on the north of the Entertainment Area, which she'll sell for you, for 10000 simoleons. It also holds a small building, most likely owned by Elizabeth, that holds three closets and rows of mannequins with clothing on. You can reach the Entertainment Area, by using the ferry (which will cost you some simoleons), owned by Nicki, to sail over there. There is an unnamed skydiver to the east of the Entertainment Area, this will appear when you reach star level 5.