Is the paved path suitable for bicycle riding, and if so approximately how long is the path?

I don't cycle there, so I can't speak to suitability for cycling. However, I do see cyclers there almost every time I go. If you do both paths it's around 3.1 miles. If you go during non-peak times when the parking lots are near-empty, you can also do the loop around the parking lot, which brings it up to around 4 miles.

There are always bikers and pedestrians. Lovely place to walk, especially in the evening.

Yes. It has a path mark around the beginning.

Yes,about a mile .

Yes you can bike there, although, the peds will give you a dirty look.