The swamp was heavily damaged by fire this year, so you may want to check on what's open - but it's one of the most wonderful and beautiful places I've ever visited. This article (click) says the park is open to visitors and definitely worth a visit - but the water level is down so canoeing is limited.
I was there a few years ago, and loved it. I entered the swamp from the west side and found a boardwalk that must have been 1-1/2 miles long, weaving through the oak trees growing in the black water. At another place in the park, I found a huge alligator with her tail partly cut off, and perhaps a dozen baby alligators crawling on top of her. I lost my camera with those pictures in it, which was a big disappointment.
There are canoes available for rental - but I have to admit I didn't have the courage to go canoeing alone in the Okefenokee swamp.
-Joe-

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Click here for an article that tells how well the swamp is recovering from the fire.