My FC was thinking that it would be fun to have Sandworms to ride like in the book and movie Dune. It would be multi-rider with a quest to get a hook to climb aboard. Today I see that SE is planning a possible two person mount which is interesting but not quite what we had in mind.
When we have a FC event, such as map hunting, it would be fun to climb aboard and ride to the map location needed. Just one example but I think it would be great fun!