I've been meaning to do an indoor entrance which consists of one large building which has a multitude of shops (and maybe even an indoor ride) inside. It would be something which would be architecturally quite interesting looking (because of it's scale) and maybe have 3 or 4 paths which lead out of the building and into the park.
Something i'm trying right now is having a more natural flow of areas. So you enter the park at a beach and the park just sprawls out in front of you with a couple of large paths. As you move away from the beach you enter a small village which slowly transitions from thatch to tile, and later elements of castle like buildings (though still 1/2 story only). Finally behind those looms two castles. One is dark and surrounded by dead trees, the witches castle. The other has grand gardens, a lush array of greenery and bright grand flags, it is of course the princesses castle. They are all looking like real little towns, with a scattering of buildings and shops, plenty to explore. As such they blend more naturally.