Only thing I significantly disliked was the bobsleigh's layout for the section over the water.
The reason why it's like that is that when I build a Roller Coaster I don't have a plan in mind. It's often the first draft and I make it up as I go along. It slows down there because I tweaked the launch speed so that the Coaster will make it around the track just. Reason being, as I've never been on a Roller Coaster I had to assume that the launch downwards could be too intense if too fast. I was also concerned that the vertical twist in the last section and hills-bumps could be too extreme if the coaster travels too fast. As there was no section to sneak in a break to moderate the speed, that was the best solution.Only (big) shortcoming is the slow section at around 0:18