Yes. 3 days is more than enough. We did 4 days last time we went but it was mostly so the wife and I could have a day to ourselves while our kids did all their favorite rides. We normally do just 3 days or 3 and a morning before flying out.
Use the early entry option for hotel guests and you're going to get so much accomplished before 11am. If you do
Genie+, you can get most of the rides in before the crowds arrive and then use Genie+ to do the rest. Get park hopper tickets since the parks are only separated by an esplanade.
Disneyland Daily has some great strategies on her website and Facebook. She gives reports on how her strategies worked and she definitely knows how to utilize Genie+ to help get more rides in.
Definitely use the early entry for Fantasyland or Tomorrowland for your DLR days and Avengers Campus at California Adventure (Webslingers and Guardians).
EARLY ENTRY RIDES AT DISNEYLAND
- Alice in Wonderland
- Astro Orbitor
- Buzz Lightyear Astro Blasters
- Disneyland Monorail
- Dumbo the Flying Elephant
- King Arthur Carrousel
- Mad Tea Party
- Mr. Toad’s Wild Ride
- Peter Pan’s Flight
- Pinocchio’s Daring Journey
- Snow White’s Enchanted Wish
- Space Mountain
- Star Tours – The Adventures Continue
EARLY ENTRY RIDES AT DISNEY CALIFORNIA ADVENTURE
- Guardians of the Galaxy – Mission BREAKOUT!
- Incredicoaster
- The Little Mermaid ~ Ariel’s Undersea Adventure
- Mater’s Junkyard Jamboree
- Monsters Inc. Mike & Sulley to the Rescue!
- Soarin’ Around the World
- WEB SLINGERS: A Spider-Man Adventure
I would definitely say to hit up Fantasyland one morning for Early Entry and Tomorrowland on the other. Then you can be ahead of the rope drop crowds for those rides and move on to Big Thunder, Indiana Jones, Haunted Mansion, or Galaxy's Edge.
In California Adventure, I'd use the early entry for either Guardians or Webslingers. Then you can use your Genie+ to re-ride either later on. I think Guardians is fantastic to ride at night. We tend to start our morning at Pixar Pier as that's less crowded. So you could hit one of those Avengers Campus rides and then head over to Pixar Pier to ride Incredicoaster and Midway Mania.