Just got off the phone with this company.
http://paradisoyachtcharters.com/

Their price $3500 for 4 hours and it accommodates up to 55 people.
If we want to add 1 hour, its $750
I asked about booze and they said since they have a liquor license they have to pour the alcohol but they would let us BYOB.
This boat stays in Newport but the lady also said the boat is decorated and the houses are all decorated and they will take us around.
What the lady did say was that Boats dont generally go into Hunting Harbor because the bridge is too low for alot of the boats.

I like this one better than the previous.