Florida seems to have a lot of theme park"family fun" place in the state and it is warm so...that appeals to people who...have families and like / want warm weather.
Vegas IS adult fun...there may be things for the under 21's to do..but the majority of Vegas is for adults.
You could try Southern California, Disney Land,Universal Studios,Lego Land and then some Hollywood related "tours" as well.
Nor Cal is..kind of like NY , $$$ and not a lot of "family fun parks" but , the coastline is beautiful as is wine country and there are fun "road trip" places to go IF you are willing to drive while on vacation