If it is the one on Harbor next to Embassy Suites South, then I do not think it is walkable. We used to stay at ES until it got to expensive, and we always drove to the parks. Now we stay at CCI or HOJOs and walk.
I love Hampton Inn's though, in general - they are great hotels.
Edited to add: I just googled it and it is 1.3 miles - says 26 min walking. So I guess it is walkable, not sure I would want to walk it, though, lol.