It Opens at 9 am

There is no fee to go to the park and take pictures. It is open to the public

There is no restictions in taking photos.

英語のbikeは自転車の事です

I do not see a reason for it not to be allowed. However, it might not be appropriate as the walking path itself is not that wide and is usually very crowded. The park itself is small and would be much suited for sitting down and taking a break more so than walking around.