I love HH and the weather in Feb. COULD be quite nice but also could be cold and blustery (welcome to the south!) There is a mall which is walkable from the Disney property but I can;t see teenage girls loving HH for more than a day or two off season (unless they play golf).
Have only been to Vero once. Enjoyed our stay but I was the one who was bored!!!! Have had better experiences at other beach resorts.
We took our teenage son and two of his buddies to OKW this past spring break and they had a ball. I did not force the theme parks on them but they had lots of freedom thanks to Disney transportation. They did the Segway tour, we rented a boat, and they went to a Braves spring training game...also spent lots of time in the parks but they enjoyed doing the other stuff a lot, too.
So, I understand the reluctance to do WDW again but it is really hard to beat for families with teens!