Hi, I'm 17 and I just remembered this movie I saw when I was a kid, except I couldn't remember it very much. So I'm sorry but my description is kind of vague:
From what I remember, I think it was live action but had fantasy creatures in it and the kid(s) got to this fantasy land by sliding down a slide I think and then I don't really remember much else but maybe a tree that they used as a sink or I don't know some weird fruit, but I do remember that they all sang "Jimmy Cracked Corn and I Don't Care" at one point in the movie. And that's all I remember, please help, it's driving me crazy!

You're probably thinking of "Wee Sing in the Big Rock Candy Mountain"

OMG that's it! Thank you so much!