I would recommend to goto their web site. They have all the info. I also recommend renting a boat during weekdays s. Much less crowded. If you want to goto the channels. Look at the tides time table to make sure you can pass under the bridges.
Varies.. but always reasonable .. reqs are few.. mostly common sense and some knowledge of boating helps ... be nice .. they get slammed ... but they always make up for it ... been going there multiple times a year for over 2 years ...
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