It will be hard to find a 'resort with amenities' in a rural area. The resorts are pretty well located in the major cities.
I don't know if you're familiar with Arizona's elevations or not but basically for warmth in winter you'll want to look at the following areas:
One is the greater Phoenix area over to Apache Junction.
There's also the Colorado River area from Yuma to Lake Havasu City. Havasu can get very windy and cold compared to Yuma. Yuma is the warmest spot in winter.
You don't want to go any further north or east.
Then there's south of Phoenix. Some stay at Casa Grande but we find it very dusty. You wouldn't have the cultural activities as you would in the Phoenix area and it's too far to day trip. If you're a hiker, the Apache Junction area is where you'd want to be, not directly in Phoenix.
Tucson is another popular area and the Voyager RV park is the place to go for the 'resort' feeling. It has every type of activity, pickleball, tennis, craft classes, woodworking, etc. Tucson also has excellent hiking and cultural things. It's a much smaller, laid-back kind of town compared to Phoenix. It's not a 'glitzy' town but we enjoy it.
About 30 miles south of Tucson in Amado is DeAnza RV. It is in a rural area but shopping is close in Green Valley (WalMart, groceries, restaurants). DeAnza's sites are fairly close to each other. They do have an indoor pool and some activities.
For another more rural area some choose Benson which is 50 miles east of Tucson - still manageable for day trips into Tucson. It's a little higher elevation so it does get cooler, especially at night but usually warms up by 10am. Probably the best parks would be Cochise Terrace or Butterfield. Both have 'some' activities.
We've wintered at the Benson Saguaro Escapees RV Park. On their web site you'll find a coupon for $50 for a one-week stay for non-members. If you want to stay longer you'd have to join Escapees (a great organization) and I believe the cost is $30/year now which includes a terrific bi-monthly magazine written by RVers with very little advertising. The park is extremely friendly and the sites are built on a terraced hillside for views. The sites are very large and landscaped by the site owners. The site you'd be placed on is one that the owner is not using during that time period. Each site is different. There are many basic activities in the nice clubhouse including concerts, shows, movies and meals are also served. If you'd happen to be there in December there are fantastic programs for the holidays and a festive Christmas Day dinner. Here's the web site:
http://skpsaguaro.org/special-offers.htmlFor a first-time season to Arizona, personally I wouldn't commit yourself to one park for your whole stay. What if you didn't like it or the area? Try out different areas by the month and then you'll know where to zero in on during future visits.