This is the best video available, showing how to get all trophies in Crimson Park. It is highly recommended to use a 300HP sports car, as some trophies are hard to reach without top speed.
I take no credit for the video's creation, Pointy Pete has done a great job and he is the one you should thank...
My suggestion would be to go first for all the parts in Crimson Park to familiarize yourself with it and then go for the trophies, as this video has a lot of skipping and could confuse you if you do not know the park well.