Marriott's Newport Coast Villas resort is a terrific resort between Newport Beach and Laguna Beach, California. All units are two bedrooms with two baths. It's on
DVC's World Passport Collection (II) List. The location is great.
I have an article about how this resort was originally going to be a DVC resort:
Disney's Newport Coast Villas, The Disney Vacation Club that Never Happened.
At one time, trades into the Newport Coast Villas resort were very difficult, but it's gotten easier as the resort has grown and more owners are trading out. The Newport Coast Villas resort has two Marriott seasons, Gold and Platinum—but these seasons really don't correspond to actual demand. It's now pretty easy to get an instant II confirmation for weeks from September through December (Platinum Season), as long as you're trading something strong enough (and DVC should be strong enough). It's harder to get instant confirmations for spring (Gold) and summer (Platinum), but such trades are possible through ongoing searches, if you plan ahead. Spring will be easier than summer.
The Four Seasons Resort Club Aviara in Carlsbad, California, is a much harder trade. Four Seasons owners pay so much that they tend to stay at their own resort or at least to stay within the Four Seasons collection. I've seen studios in May or early December available for instant confirmation, but even these are rare. The location isn't as good as the location of Newport Coast Villas, except that the Aviara resort is close to Legoland and more convenient for day trips to San Diego County destinations. And the resort itself is a "destination"—more luxurious than DVC or Marriott.
There are three Marriott timeshares in Palm Desert and a Westin timeshare in Rancho Mirage. I've stayed at Marriott's Desert Springs I, and it was great. With Westin, watch out for two different kinds of 1-bedroom units. The 2-bedroom villas lock off into spacious 1-bedroom units and smaller 1-bedroom units that are more like gloried studios. The latter have "limited kitchens," which is how you can tell them apart event though they're both 1-bedroom units.
The recommendation to arrange a private exchange through TUG might be a good one, but it's not something I would want to do. There are risks and potential hassles. I'd rather have the convenience and safety of a DVC/II exchange. But I'm not saying that a private exchange is bad advice if you do your homework and take precautions to avoid getting cheated.