If romance is what you are looking for do not hesistate to book the St. Regis. The views from the St. Regis are truly the best on earth. The beach is very nice and there are far fewer children than at the Westin.

I would save the Westin for when you are coming back to Kauai with your new baby/family. That is what the Westin is geared for...the St. Regis is all about luxury and Romance.