I think the beginning of the path is marked, but it's really just a direct path between the hotel and City Walk/IOA and Universal Studios parks. Easy path to follow (watch out for the surrey bikes) day or night-well lit at night too.
The hotel staff at check in was very helpful and explained, before I even asked, (and gave us a map) of how and when to get to the parks for early entry. (We checked in a week ago today and checked out on Tuesday.) We left the hotel about 40-50 minutes before opening and had time to walk there, my brother upgraded annual passes and we bought tickets for six of us and still waited about 5 to 10 minutes before they opened 15 minutes before announced rope drop time.