The Hilton Garden Inn Portland Downtown Waterfront (to use the full, awkward name) fronts a parking deck and ferry terminal, not giving (many rooms, anyway) an open view out of the harbor. The ferries are handy for getting such views, however. It is very well located, really.
http://hiltongardeninn3.hilton.com/e...HGI/index.html
Don't confuse it with the PWM airport HGI.
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