Here are a few suggestions:
At DL:
Take a ride on the train and stay on for a round or two. That gives you a nice sit-down break, and there's a lot to see from the train, including the Grand Canyon and Primeval World. We don't often ride the train as a ride as opposed to just transportation, but it's fun when we do.
Go into the Opera House and spend some time looking at all the exhibits that are currently in there. They're fun to look at, especially with all the descriptive signs. Then you can enjoy the 50th film as well, if you haven't seen it yet, or even if you have.
In the late afternoon, go to Flag Retreat.
Relax on the porch on Main Street - it's a great place for people watching.
Stroll down Main Street and look at the names and descriptions on the windows. But space that out or you'll get a sore neck! Look inside the windows of each store - some of them have really cute decorations. I particularly enjoy the window decoration of the Hotel Marceline, which is right next to the entrance to the lockers in the middle of Main Street.
Enjoy the Tiki Room and the Jungle Cruise. Not sure if you'd be up for the treehouse, but if you are, look at everything. There are all kinds of details, and in the one room, if you touch the globe or the book (I forget which), the pictures change.
Enjoy the Aladdin and Jasmine storytelling.
Enjoy Billy Hill and Hillbillies at the Golden Horseshoe.
Have a nice trip around the Rivers of America on the Columbia or the Mark Twain.
Spend some time looking at all the nifty things in the Sparkly Store in NOS, aka Jewels d'Orleans.
Enjoy the Haunted Mansion.
Go to the Hungry Bear and sit upstairs waterside for a break. It's a great view of the Rivers of America (depending on what kind of scaffolding/fences they have up on/around Tom Sawyer Island) and very relaxing. Wave to the people on the boats going by.
Enjoy the Winnie the Pooh ride.
Spend some time in Toontown, looking at all the details on the buildings, on the sidewalks, everywhere. Play with the various "toys" in the area between the Five and Dime and Roger Rabbit. Have the husband stomp on the talking manhole cover.
For another break, go to Fantasia Gardens and relax there. It's fairly quiet with a nice view and sometimes, ducks to watch.
At DCA:
Go into the Animation Building and have a seat on one of the comfy couches and watch the cycle of animated movie segments in there. It's comfortable and fun and is also a nice break.
Enjoy Muppetvision 3D. Be sure to watch the scrolling LED in the waiting area. It's really funny!
Enjoy the Monsters ride.
Enjoy Aladdin the musical.
Sit by Tower of Terror and enjoyed the themed music, as long as the people aren't too loud. Enjoy the screams of the people on the ride, knowing you'll be able to go on it again next time.
Enjoy Heimlich's Chew Chew Train.
Go through the bread and tortilla exhibits. And get snacks there too!
Go on the non-moving car on the Sunwheel if you're not afraid of heights. (I don't think that has a pregnancy restriction. Can't imagine why it would.)
Enjoy Golden Dreams.
Stand by Grizzly River Rapids and watch the people get wet.
Around the resort:
Spend some time in the lobby and Hearthstone Lounge at the Grand Californian Hotel. It's very pretty in there and makes for a nice break.
Stroll through the shops at Downtown Disney.
And yes, there's always shopping and snacking.
Have a great trip!
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