I'll second previous suggestions !!!
Myself and husband (in our fifties)

ALSO loved a meal at Yacht CLUB , at the Newport Bay hotel ,

followed by a romantic walk around the lake : at night it's magic !!
At YACHT CLUB we had a table by the window and tasted their wonderful Surf and Turf giant platter ( seafood and high quality meats) , followed by crepes aux Grand Marnier , flambed at our table .
There were few tables in our corner of the dining room and it was quiet and very relaxing !!! Our French server was great - and , at the end of our meal, presented us a cup of small shells and small dark chocolates ... as memento of a perfect evening !
Yacht club is a bit pricey - but well worth it IMHO !!
Have fun looking for YOUR romantic restaurant ! laura