The plan is to ride north starting at Van Cortland Park (in the Bronx) and ending in Brewster, NY. We will take the Metro North back to the city. (you will need a special bike permit to take your bike on the Metro North. It is $5 and last a lifetime).
This ride will be close to 50 miles, but not very hilly and mostly on a dedicated trail (although there will be some street riding).
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You should come prepared for a full day of riding. Make sure to check the air pressure in your tires before the trip. I would recommend bringing 2-3 liters of water and a full lunch with some snacks.