We need a Family Summer pre college vacation idea.
 

Looking for a Family summer pre college travel idea, a two week vacation with our kids 15,18 and 20. Thinking of Asia (hot) - England and or Sweden. Want culture and interesting meals. Possibly a mix of city and an activity "easy bike ride, beach, boat ride?" Of course money is an issue.

I adored England and Scotland. There's a ton of fascinating history and culture, London is fabulous but with two weeks you have plenty of time for day trips out of London or another "home base" for awhile. 5-7 days in London, the rest of the time out in smaller locations such as York, Brighton, Edinburough, etc. You have so many options to choose from, it would just depend on your interests.

I second the vote for London as a base. You can always take the Eurostar train and explore Paris.

travelling and a long vacation with family is very important so that the family members become more close with ach other. and holiday in london is great.2-3 weeks is more than enough for holidays with family in london.

London would be perfect. A week here and then some time in teh countryside...perhaps:
Cornwall for beaches/surfing
New Forrest for bike riding or walking http://www.thenewforest.co.uk/
York
Lake District

Or you could do a week in London and a week in Paris.

To be different, I'll vote for Asia! You can take my advice with a grain of salt because I haven't been yet -- but it just seems like more of an adventure than Europe! I imagine since you posted this in the Europe forum you will get more Europe votes -- I wonder what would happen if you posted on the Asia forum?

goodness -- just saw that you DID post in Asia as well! You're getting some really great answers. Good luck with this decision.