According to most Rabbonim Tevilas Keilim requires a natural body of water. Generally named lakes are natural (you can check google maps).
Boat ramps are the easiest way to reach the water.
Pro Tip: Although most bodies of water in Florida have alligators it is extremely unlikely that you will come across one.
NEAR THE DEVELOPMENTS
Davenport -Northeast Regional Park
Poitras Rd 2, Davenport, FL 33897 USA
Closer to the developments
NEAR THE FRUM COMMUNITY
Lakes Down Boat Ramp
9619 Conroy Windermere Rd, Windermere, FL 34786
This is quite far from the developments but only about 10 minutes from the Kosher Winn Dixie on South Apopka Vineland Rd.
We recommend this one as it is very easy to dip off the boat ramp, and if something falls in, it’s only about a little more than a foot deep (Depending on the tide).
This is the one used by us locals.