Just a short list:
Cascade peak - it made the rivers of America so much more interesting and alive
Fantasia ice cream - Carnation may be gone but why can't they bring this recipe back?
Tahitian Terrace - I can't believe they don't capitalize on the modern tiki craze?
Indian Village - Critter country is just lame. A new Native American themed area would be well received. Knott's has had a positive Native American presence for decades.
Swiss Family Robinson Tree house - maybe it will inspire a modern live action film for this century.