Trave OK

I have 2 kids (ages 2 and 4) and am trying to decide what to do for this
summers vacation..have narrowed the choices down to a few. Hampton Beach,
NH, Ocean City, MD, or ***ia Beach, VA. If anybody has been to these
places please tell me what you recommend as far as hotels/motels,
attractions, etc.  are concerned.

Thanks.

P.S Also thinking of going to Niagara Falls for a few days. Any info on
where to stay and attractions like Marineland would be appreciated.