Here's my take on romantic restaurants here, as a loco local, a crazy gringa. When we have guests and make a list of can't miss restaurants or are celebrating an anniversary, here's my picks. Capricorn is gorgeous, the boat ride on the sea watching the stars without light pollution is part of the magic, to me. The food is outstanding, the owners are really friendly and warm. When we used to live on the mainland and visit here, we'd go there specifically for the great filet mignon. The ambiance is romantic, with sparkling Christmas lights and candles.
Victoria House for dinner is superb. I had a wonderful filet mignon done in a spanish style, which is hard to explain but delicious. The dining room is a romantic white on white with candlelight. Since it's inside there's no worries of mosquitoes or sweating too much on a humid night which of course kind of ruins the effect!
If your trip happens to coincide with a wine dinner hosted by Wine Devine, that would be perfect. They feature a different restaurant every time with a special tasting menu and corresponding wines for each course. Chances are it may not be scheduled for your week here, but you can always check their website. For everyone else, it's something to think about attending. It's formal (if you want to dress up) and lots of fun.
Just my opinions, thanks for listening to my long post. Sorry for going on and on. Boy I'm really hungry now!