Create a fantastical visual collage centered on the whimsical concept of pineapple castles. Think towering structures that take the distinctive form of a pineapple, complete with the jagged, diamond-patterned surface and the leafy crown. The castles should be imbued with an adventurous and magical essence typically found in fantasy novels, perhaps shining brightly in the sunlight or nestled in an ethereal twilight mist. Surround these castles with other elements commonly associated with the fantasy genre such as mythical creatures, enchanted forests, sparkling rivers or majestic mountains. Play with light, shadow and color to bring this surreal vision board to life.