It's funny that you created this topic. I am the creator of the "Sack to the Future: The Ride" level. I'm glad you enjoyed it, but I'm not really good at the creation tools that this game has and consequently, the level looks and plays very sloppy in my opinion.
Just yesterday I began to remake the level, so far I only have the entrance to the Institute created. As for the ride portion, I want to overhaul how the ride itself works. For an example of what I want to go for, check out the Star Tours portion of the "Disneyland 3" level (the name of the author escapes me). In addition to that, I want to add nicer looking buildings for 2015 and maybe even the Ice Age and Dinosaur eras if space allows.
This remake may or may not end up happening, but I do have motivation to do it as of now and hopefully I can get some of it done during summer. Thank you once again for enjoying my (only) level created in LittleBigPlanet!