If you're spending some time in Key Allegro, Matagorda Island and Kenedy Ranch Museum are top sights worth seeing.
Though Harbor Oaks might not have many top sights, you can venture to the surrounding area to see attractions like Matagorda Island and Fulton Mansion.
Palm Harbor might not have many top sights, but Rockport Beach Park and Aquarium at Rockport Harbor are two attractions nearby that you can check out.
While there might not be top attractions in Estes, you can explore the larger area and discover places like Conn Brown Harbor and The Gallery of Rockport.
While Copano Village might not have many sights to explore, venturing just a little farther will lead you to top things to see and do like Fulton Mansion and Copano Bay.