Anything that is fun and interesting.... >:3
Go ice skating with some friends! [REALLY FUN!]
Some good and fun picnic ideas can be found at the Funthingstodo.com and the Funideas.com. Both website contain a lot of fun ideas for couple or family picnic.
Runescape
www.familyfun.go.com has a variety of great fun family ideas. It is a great location to get some great ideas for any family!
heres some games i play or some that r fun Zwinky.com supersecret.com roblox.com freereamls.com wizard101.com
Some fun dating ideas such as going to the beach after sun light and having a candle lit picnik. You can go to an amusement park, you're never to old to have fun.
Anything that has to do with dating. Trust me I know what I'm talking about.
Go to the pool! Meet other teens.
There are many great ideas for day trips that kids can have fun on. Some great day trip ideas are, waterparks, beaches, parks, interactive museums, and art's and crafts festivals.
There are many fun and safe things that teens can do after prom. Arrange for a rented limo or van to take the teens to a late night diner where they can get a meal after prom, or host a slumber party (with appropriate adult supervision!).
Some cheap and fun ideas for a housewarming gift would be something you make on your own. Maybe consider making a vase or a card.