I've been to the Port Charlotte area a few times for a week in March or May and seen lots of great birds without a guide.
Even in the car driving on US 41 you can see egrets, heron, ibis on the verges. Once saw a glossy ibis on the median!
I've had both a swallow tail kite and a tropicbird fly over the highway. I've also seen lots of good stuff in the garden where I stayed: red-bellied woodpecker, Carolina wren, mockers and nearby, scrub jays, pileated wpks. Once, a gorgeous great-horned owl stayed for a while.
Good places to visit:
Boca Grande -check out area around Harpers Marina for pelicans, herons
Gasparilla Island - great for osprey and Royal terns , gulls
Punta Gorda -Peace River trip - wood stork rookery, different herons
Ponce de Leon Park- good at sunset at estuary for different herons (on the way watch for burrowing owl site)
Port Charlotte harbour - black skimmers, terns, heron. Again good at sunset
Myakka River State Park - boat tour worth the trip. IF you miss the last boat it's still worth it to take all the trails.
I usually see something interesting at the dam - last time a limpkin, prior several sandhill cranes.
Lemon Bay, Blind Bay pass (nr. Englewood); osprey, gulls, ruddy turnstone
Venice: watch for the (feral) green parrots! Also ibis on the rooftops. Check out the harbour, fishing pier (Sharkeys for lunch) and then there's the ROOKERY - NOT SO EASY TO FIND BUT WORTH IT.
Take US 41, driving north, take first left on Annex after Jacaranda. We visited this twice. At pond on left we saw pr. of common gallinules and green heron. Further in on right: trees full of herons, anhingas and egrets. As we were there in May many young seen. Enjoy! PM me if you want more detail.
P.S. When you're on west coast we expect to be in Pensacola area for a week so we'll be able to compare Coastal Birding!
Any tips from anyone on this area?