Nex-5r Favorite Vacation Lenses?

I am going to be traveling to Italy on a family vacation in May and I am wondering what is your favorite lens or lenses to have on vacation with you.

I am looking to add another lens to what I currently have:

Nex-5r w/ the kit 18-55mm & Minolta Rokkor 50mm f/1.4

I have heard really good things about the Sigma 30mm.

Thanks so much!