Can 2 people play or only groups of 4 or more?

Yes they can

Yes, two can play.

Groups larger than 6 people should reserve the bays 3 days in advance. 2 people can mosdef get a bay.

2 can easily play...or more

2 people can play. You can play with up to 6 people on a bay.

Yes

2 people can play. 1 can even play.

Yes you can have large groups,just have to reserve in advance