The MacDonald resorts thru RCI are nice. We stayed at the Vilacana in a 2 bedroom- IDK if they have 3 bedroom units, which would be better for privacy for 6 people, especially if they are couples. We actually got that exchange thru DAE which is now operating under a different name. That timeshare was in Estapona and from there we took day trips to Marbella, the Alhambra and Ronda as well as booking a full day tour to Tangier.
A few years ago we visited Malaga on a cruise and loved that city so a timeshare in that city would be nice too.
Look through the RCI website and see which resorts are well-reviewed & have 3 bedrooms. There are also reviews on TUG that are more detailed but fewer in number and may be from years ago! Put in an ongoing search immediately. I am not familiar with Wyndham so you may have better luck searching through their portal. Ask about that on the Wyndham forum o TUG.
Good Luck!