I guess this isn't really a postcard, more of a handbill since there is no space for addresses. It may have come in an envelope.
It is essentially an advertisement for something called Alice in Wonderland Days - a promotion I know nothing about. Doubly odd since Alice wouldn't be re-released theatrically for another three years, and there was certainly nothing new at the park related to Alice. It appears that the promotion consisted of parades and photo ops, but beyond that I have no idea. If anyone has details on what this promotion was all about, I'd love to hear from you!