The Earthly Delights comes in a nice tin that would be great for storing things and comes with lots of non-sexual but sensual things that they can try! I am also partial to the Kamasutra oils
The chocolate kit, it's romantic and playful without being intimidating.
It would probably be the best choice for the honeymoon so they can have a little treat as they get to know one another in a more intimate way.
It would depend on how well you knew the couple, but I like the earthy kit and then the chocolate heart kit. I wouldn't get the kit with jelly toys in it for safety reasons.