For going to any of the big 4 parks, everything's very well marked. For going to one of the hotels, water parks, or other attractions, I would definitely recommend the smartphone GPS. Couple years ago I stayed at a Best Western out by the intersection of 27 and 192. I wanted to go to WinterSummerland Minigolf. The GPS took me in one of the "side" entrances that I never would have found or figured out on my own. (Still had to park at Blizzard Beach next door. The tiny minigolf lot was full.)