1200 W Retta Esplanade, Punta Gorda, FL
I've been wanting to try this, so let's do the Punta Gorda Harborwalk and Linear Park.
We'll meet at Fisherman's Village at 10:00 am, from where we can first do the Linear Park (about 2 miles round-trip), then continue on to the Harborwalk (just over 4 miles round-trip). So the whole distance will be over 6 miles, but those who wish to may turn back at any point to walk the distance they choose.
Linear Park info:
Although I can't vouch for them myself, the trails do receive good reviews.