Also I think Hot Air Balloons would be appropriate for a romantic pack. Like with TS3 Sims could toast in them,propose engagement,makeout and woohoo and when in the air use binoculars.
And let's not forget about the Romantic Picnic Basket that sims could cuddle on,toast on,makeout and woohoo on,apply sun tan lotion on and feed each other a bite on. A blanket could form during the woohoo animation. A Bear Rug with the same function could work as well indoors in front of the fireplace.