Is there a travel site where I can...
 

plug in my dates for European travel and it will give me the cheapest destinations for those dates?

Hi C,

Cheapest airfare, cheapest hotels, cheapest food, cheapest sight seeing...?

I would guess that Cimbrone means airfares.

Yes, airfares.

Interesting idea..you have a week off, for example, and would like to know which destinations you can access for a good price??

You could try www.airfarewatchdog.com

for starters..but there may be better sites...

I don't know if you can plug in specific dates, but farecompare.com has a tool like that.