I've got an idea that is certainly not as cliche as Hawaii, and may just be what you are looking for.......

I'm not sure if you have ever, or have not been to Prague, CZ, but the Charles Bridge (Karluv Most) on a beautiful summer night could not be a more perfect setting IMHO. If you have been there, you know exactly what I mean. I really wanted to propose to my wife that way, but at the time, I was but a poor college student with no means to make that actually happen.

Lake Bled in Slovenija may also be something that is attractive to you, esp. if you are more attracted to the outdoors and the beauty of nature vs. a city.

Best of luck to you in whatever route you choose!!

Alex