I have a need (desire) to save a small collection of YouTube travel videos to my notebook computer. I would like to have access to these videos while I am on my vacation to Venice, Greece and Istanbul. I especially need these videos on my computer for researching the ports I will visit during my Greece cruise. Apparently the Internet access aboard the Royal Carribbean ship, Allure of the Seas, is both slow and extremely expensive...
I am planning to do my own tour planning for the majority of the places we visit. What my wife and I are interested in seeing is not necessarily what canned tours will visit and even if they did, I want to be the one to decide how long and at what time I will visit the various points of interest.
As an example, the changing of the Evazoni (Palace Guards) in Athens is very important to both my wife and me. There is a minor change of the guard virtually every hour (the major guard change occurs on a day we will not be visiting Athens) but, I want to get there early enough to get in the front viewing row.
I learned my leason in Hong Kong about depending on a tour to get me places at the time I want to be there. By the time that the our tour got us to the Kowloon side of Hong Kong Harbor to see the Hong Kong Light Show, there was already a large crowd gathered to view the spetacular. I had to shoot from the rear of the crowd. Being 6'1" tall, I was able to shoot over the heads of the primarily shorter crowd. However, that meant no tripod or monopod use. Luckily, my 17-55mm f/2.8 IS lens bailed me out of that problem by being able to get sharp images at night, hand-held.
ISO 800 (the highest I liked to shoot my 30D), 55mm focal length, 1/25 second @ f/2.8

As always, Google is my friend. I attempted to Google this query regarding saving the YouTube videos but received such a large variety of answers that I am right back where I started before the search.
Have any of my PTON friends downloaded and saved YouTube Videos and perhaps could walk me through how they did this?