I like Mice 'n' Easy. It's simple and there's no big challenges in the way. You can fall off the level, which will add a few seconds to your score. Although it's not my favourite, there are two other ones which I prefer. I can't really remember the names of the other two, but here's a description of each stage..

Skateboarding Level

I love this one. It's a skateboarding level, one of the only stages that doesn't make you walk around which you'd usually do. The half-pipes mean you have to jump more, which can be hard at some points..

Water Level

You're in a watercar thing, and there are little balls which assemble the course. You've to keep in it, or you'll get a point off you.