Took my two year old last year. Going again in 2 weeks now that she's three. We actually spent an insane amount of time there simply because we made it out half day, as we arrived to our hotel around 11am. Ate lunch at T-Rex, then dinner at Rainforest Café. The two Disney stores are super great, and she killed some time playing with the potato heads. She also killed time playing with the diplomat blocks at the
Lego store. There's also regular Legos for the older children. And of course, digging for dinosaur bones while waiting for our table at T-Rex.
Then, the day we were supposed to leave, outfought got canceled. Twice actually. Three times, if you wanna get technical. Since we didn't know that we were going to have an extra day, rather than pay extra to go to AK, a park we had not gone to that trip, we decided to go back to Diwntiwn Disney. We rode the tiny train and the carousel. There's of course that giant balloon if you wanna pay for that experience. Then we killed an hour having her play in the floor fountain with the other kids.
Personally, I think she would've been too young for Disney Quest, even this time around. And considering how expensive admission is, it would be stupid to hafta pay for her too. But I think a 1st grader would love it. But be warned. I've heard that it hasn't been updated or maintained since the 90s. Last time I went was in 2005. Only issue I had was my buzz lightyear bumper car got stuck in a corner the entire time, and this stranger insisted on being with me even though me and my newly wed husband were standing in the singles line for a reason.