Some cards can only be used in certain resorts, and will only show in the card bar while you're in the correct resorts.
You can see if a card is only suited for a certain reward when you click on it in the shop, trading interface or inventory. You'll see an icon in the larger image that appears on the left.
Palm Tree - Beach Resort
Mountain - Mountain Resort
Giraffe - Safari Resort
You can always find all of your items in your inventory - the last tab in the shop: