I took my sons ages 9, 6, and 4 on the flat easy North Pioneer Trail. We went all the way to the St. Lucie River and the kids dipped their feet in and then we came back. We'd had a long day already and my 4 year old was done so we save the South Ais Trail for the next day (it's only about 6 miles from our house!). This trail leads to you to an Indian burial mound (which you are NOT supposed to climb). There are some bridges along this trail and at parts before and after the access to the bridge was quite muddy, but my boys certainly didn't mind. :-)
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