One major difference between Shinjuku Gyoen and other parks in Tokyo such as Ueno Park and Yoyogi Park is that visitors are required to pay admission fees (200 JPY for adults, 50 JPY for children) to enter Shinjuku Gyoen. 

Another main difference is that there is a rule restricting visitors from bringing alcoholic beverages into the park. I don't mind this kind of rule as there is a strong alcohol smell in the air at both Ueno Park and Yoyogi Park. I prefer inhaling fresh air to air filled with booze's smell when I enjoy looking at those pretty cherry blossom flowers, thank you very much.

Our admission ticket comes with a barcode which will be scanned by the security staff standing guard at the park entrance. Your bag will be checked for any alcoholic beverages so don't even try to sneak even a bottle inside. 

On the last day of our trip, the sakura flowers have fully bloomed in Tokyo. At last, we were able to see sakura at its full glory (am I being too much? Hahaha). Shinjuku Gyoen is filled with so many people, especially families, that morning. 

Once again, we were lured by another white sakura tree. 

Sakura flowers in full bloom. Aren't they pretty?  Sakura does not last very long especially when it is raining a lot. Better enjoy it as soon as it has bloomed. 

Shinjuku Gyoen opens daily (except for Mondays) from 9AM to 4.30PM (last entry is 4PM). If you visit Shinjuku Gyoen during the cherry blossom season (late March to late April) and the Chrysanthemum Exhibition (first half of November), Shinjuku Gyoen opens every day.