I bought a 70-300 Nikon ED VR specifically to take pictures of the moon, and it does a pretty good job. Turns out it's useful for a lot of situations (birds and other wildlife). My vacation setup is normally iPhone + D7100 with the 70-300 attached. That can easily cover most situations w/o changing lenses around too often.

I'm planning on picking up one of the Nikon mirrorless FFs soon.