Bowling, go out for ice cream, roller skating, if y'all are going out is always fun.
If not, there's a game my chapter plays a lot called "Tap a sister"
How to play: Put on some soft music and turn the lights low so it's relaxing. Have everyone spread out, lay down, get comfy and make sure their eyes are covered. Pick two to four sisters to be "tappers."
Then, say out loud things like "Tap a sister who you can always trust" "Tap a sister who makes you laugh" "Tap a sister with a beautiful smile" "Tap a sister who you can always have fun with" etc.
The tappers go around the room and tap sisters on the head as you say these things. The point is to make sure everyone's been tapped at least a few times apiece by the time it's over with. It's a lot of fun.