I am cruising down the Danube River on a brand new Viking River Cruises boat. For me this is an ideal vacation for two reasons:

1. It is reliable. I will sleep in the same bed each night. No need to check into different hotels. I will savor my meals in the same dining room. There is no pressure to search for a new restaurant every few hours. I won’t have to pack and unpack, suffer through security at airports, or deal with unpredictable taxi drivers. I will enjoy the reliability and comfort...