I think one of my favorites was the Burrowing Owls at the library in Cape Coral. Some people we met at Corkscrew Swamp recommend this area to us.
We also were fortunate to be at the Lighthouse on Sanibel Island when a large influx of warblers landed, and we found out we were viewing them with Lillian and Don Stokes (the authors of the Stokes Field Guides). We got to see a Yellow-throated Warber and a Prairie Warbler, but dipped on the Yellow-throated Vireo.
While at Bunche Beach we got a Marbled Godwit and a white morph Reddish Egret, who was wearing a transmitter on his back.
Our beach on Sanibel Island had lots of Willets, Sanderlings and Black-bellied Plovers and the occasional Ruddy Turnstone. We found a Loggerhead Shrike and a Cowbird on the causeway.
On Estero Island, behind the old Holiday Inn, we saw a white morph Little Blue Heron, a Boat-tailed Grackle and another Anhinga. The Anhinga was fishing and sunbathing.