Good Planning
I will echo what many have said here in that planning is the key to making the most out of your time. There are a number of books including
"WDW for Couples" by Rick and Gayle Perlmutter that DiPSU224 suggested, also a Birnbaum Disney w/o kids, an Unofficial guide for grownups by Zibart, Fodor Disney for Adults and Rita Aero for Adults. Check them out in the book store and pick one that reads best for you.
Also mentioned was the allearsnet site that is great for all kinds of information. I like to use it for sample menu's from the restaurants.
OK, so you have the four parks, and following your "no thrill ride" criteria,
At MK, Main Street is just fun, Micky's Philharmagic, Jungle Cruise Haunted Mansion and Pirates of the Caribbean should be seen. You can determine if Splash Mountain and Big Thunder are too much for you.
Restaurants are more modest here, I like Cinderella's Castle, Liberty Tree Tavern and Harbor House. The parade is fun and you must stay one evening for Wishes fireworks.
Animal Kingdom (AK) should meet your likes nicely, maybe not for a full day...
Don't miss the Festival of the Lion King show, Kilimanjaro Safari and The Tree of Life with It's Tough to be a Bug and Flights of Wonder. Dining here is also fairly casual.
Disney MGM, well many go for Rock and Roller Coaster and Tower of Terror, which will probably be off your list. There is an Indiana Jones show which is nice, Great Movie Ride, and a Fantasmic show in the evening. A number of nice restaurants here, but to pick one, consider 50's Prime Time Cafe. With your preferences, you can probably do a 1/2 day here. Maybe AK in the AM, MGM PM.
Ok, think I've saved the best (for you) for last...Epcot. Many of the rides are not necessarily of the thrill variety, World Showcase is a great place to just stroll and enjoy the people, and it probably has the nicest collection of restaurants to varied tastes. Also, many nice street performances. Illuminations in the evening should be seen.
Downtown Disney and Pleasure Island are good for an evening. If you are into dining, many of the hotels have superior restaurant offerings.
If you have any more preferences as to dining, we can offer a lot of ideas there.
Generally, don't try to do it all, take an afternoon off to swim or go to the Spa at GF.