Breakfast Place to eat in quickly

No place specific, but there are a number of cafes, coffee, and Dutch pancake places in the area. Most open 9-10 though, maybe some coffee places with light food open earlier, but 8 would be about as early as it gets.

Hoorn is only 30-60minutes by train, in fact an hour gets you lots of places from Amsterdam, a good chunk of the country, so an easy day trip.

So far as paying for transport, others may have some thoughts, but next trip I just plan on tapping with my credit card or phone. Works for nearly all transport, all over the country, pay as you go.

I read that to see the windmills and the dikes and farmland in Hoorn that you need a car. Is it within a walkable distance or do I need to find a guide with a car?

I personally would never visit 2 major art museums in 1 day. You will get art overload. I would do the Rijksmuseum on your arrival day and the Van Gogh museum the next day.
Hoorn is a lovely historical city, but if you want to see windmills and get some idea of the countryside I would recommend Zaanse Schans instead. Apart from windmills you’ll find clog and cheese makers there and lots of other old trades.
See here for more info https://www.dezaanseschans.nl/en/

The place you are staying should be able to recommend nearby breakfast places. If you don't need to eat immediately, the museums have cafes and there is an Albert Heijn cafe in Museumplein very near the Van Gogh museum and Rijksmuseum. As you may already know, timed entry tickets purchased in advance are required for both museums. I agree that both museums in one day would be too much for most of us unless, prehaps, you just want to see the most famous (but also most crowded) Gallery of Honor in the Rijksmuseum without exploring much further.

My strategy for arrival day is to keep moving outdoors as much as possible with stops for rest and coffee as needed. To this end, the self guided Amsterdam walking tours in the RS guidebook were good. A canal boat ride might be good on arrival day. -- I believe you can board one on Singel.

Dutch Traveler
Thanks for your information about Zaanse Schans. Now that I have read more about the different cities, I was looking at Zaanse Schans because if is fairly close to Amsterdam. Is it too touristy? I am also wanting to see some of the countryside. I am thinking about taking another of my 4 days in Amsterdam and trying to go to Delft, Hague or Leiden. I know that may be impossible and I may have to pick between Zaanse Schans or one of the other cities because there is a lot to see in Amsterdam. I will be leaving Amsterdam on the 5th day and traveling by train, stopping for a few hours in Brussels just to see the Grand Place and spending the next 4 nights in Brugge. One of the days I plan to take a day trip to Antwerp. Any suggestions will be appreciated. Thank you.
From Backyard

We went to Zaanse Schans on our first trip to The Netherlands. It was OK but somewhat touristy. On our second trip we went to Kinderdijk with it’s 19 windmills and it was authentic and an outstanding experience.
One thing I remember about Amsterdam was how many breakfast places we saw!

As a Haarlemmer, what experience are you looking for? Haarlem may be too close to the Amsterdam experience. Have you considered Delft or even The Hague (Mauritshuis and Kunstmuseum Den Haag)? Leiden has great museums, but what are you looking for?

Not sure what you mean by breakfast, but Lanskroon is exactly where Singel meets Heisteeg. They have some of the best stroopwafels anywhere and also have lots of good pastries, croissants, and sausage rolls. This probably isn't the place if you're looking for bacon, eggs, etc.

The Dutch Resistance Museum is worth a visit and isn't overrun by the crowds you'll see at Rijks and Van Gogh. Biertuin Oost is a great food option near Dutch Resistance...some of the best pork ribs in town.

Also, I disagree with the comment about Haarlem...it is a great town!

Thank you for the information about Lanksroon. It sounds perfect. I also had planned to go to the Dutch Resistance Museum. Also thanks for the other restaurant suggestion.

Rhspoor, I am looking for a place to see the countryside and a couple of windmills. I am not a bike rider. I have read about the other cities you have mentioned and the all sound great. I want to get out of Amsterdam and the big city for a day. Thank you.

Traveling by train may give you a feel of the countryside. Unfortunately, the trip to Haarlem will only take 20-30 minutes. Delft and Gouda are a bit further in what is called the green heart as this is a largely rural area in the urbanised west of the Netherlands, so you may see some of that by train. They will have a complete different feel than Hoorn or Enkhuizen (which also take you through the rural area north of Amsterdam). These two towns have a very strong relationship with seafaring. I think any of them would be doable from Amsterdam by train (but pick one) and they will take you through the rural countryside. Beyond Utrecht the landscape will change to more forest but that may take a bit longer.

For a future next trip in late April-mid May, the train from Amsterdam via Haarlem to Leiden and further on will take you through the tulip fields in bloom.

I guess you already have the link to https://9292.nl/en. This will give you an idea of the traveling times and whether one needs to change trains.

I have never seen so many breakfast and pancake places as in The Netherlands!

Thanks for all of the suggestions!