Saint John, NB questions

[doctoranna]

2 questions about St. John, New Brunswick:

 

1. Do the taxis take credit cards there?

2.  We are planning to take a cab to Fallsview Park to see the Reversing Rapids.  High tide on the day we are there is just after 2 PM.  Can anyone tell me, do the rapids reverse right at high tide, or somewhat before the highest tide, and if somewhat before, how long before?  In other words, how far in advance of high tide would we need to get to the park to see the reverse?