Just got back from a trip back East. My friend and her husband hosted 4 adults and 2 babies. I wanted to bake/make something special for them as a gesture of gratitude (2 babies is alot even for experienced folks). The only requirements are that it needs to survive a few days in the mail and not melt into a puddle in the current heatwave that's hitting the Northeast US.

Any ideas? I'm sort of stumped because what I know they'll like (e.g. chocolate) is just too fragile, perishable, or meltable.