A while back The Goddard Group who thought the Jurassic Park boat adventure up, mentioned that process on their facebook page. The jeep ride was there first because of the movie (Spielberg was on board designing the park) but ended up with the result being not great (they wanted to include the scene where the T-rex is hunting the jeep but the action would be behind you and because of that wouldn't work.
The book (where to movie was based on) mentioned a boat ride where the kids would try to escape a dino. That scene didn't make it in the movie but they all thought that would be great for the ride at Universal.
Artwork for the Jurassic Park island by the Goddard company ended up in the movie in the dinner scene with projections.
For an amazing read (with stunning artwork) about many of the rides/shows they created for Universal (incl de JPRR) follow this link:
http://insideuniversal.net/2013/11/interview-gary-goddard/