You might point them to Calas Galadhon. It is a ten sim public park with lots of couples amenities (no nudity allowed), such as horseback riding, boating, ballooning with cuddle, lasts almost an hour, swimming. Lots of couples like to dance at the sims. 9 of the sims have intans and lots of places to dance with no crowding. You can even have dinner in one of the houses on a dining room table from La Galleria, excellent items from an excellent creator. There are also live music events on the sims at three beautiful venues. Have them check out the tp boards at the entrance to each sim. The sims range from turn of the century to farms to mountain forests to mediterranean Islands, even wetlands and an underwater area that is very large for scuba and merfolk. There are no rentals and no shopping on the sims, all is open to the public. Have them say hi if they come by and the owners are on line. sorry if this sounds like an ad, but I think these are the most romantic and enjoyable sims for anyone who wants to experience simple life in SL.
Sorry for the double mention...did not notice Venus' mention of the sims. Thanks Venus