Of the Savannah squares I've visited and can remember, Ellis Square stands out for being the most different. Instead of being a quiet residential square with mostly grass, trees, park benches, and perhaps a serene fountain or unassuming monument, it's a commercial-like square bustling with activity. It seems to be *the* town square with a "city center" type feel. The fact that the square sits on top of an underground parking garage and has a visitor center on-site - a modern-looking one at that - already makes it very different from the rest.
Ellis Square reminds me of Centennial Olympic Park in Atlanta because of its open nature, mixture of brick walkways and greenspaces, stone tiles, steps/tiered seating, and splash pad. It's much smaller than Centennial Park, of course. When it comes to Savannah's other squares, it's one of the bigger ones. My wife and I have enjoyed our visits here over the years. Those visits have been strolls through the square to get from one place to the next (restaurant, shop/market). We've been during the daytime and nighttime. There have always been people (e.g., families) out and about and it's felt relatively clean and safe.
Ellis Square was one of the city's first four squares. It was the third built, in 1733, and originally named Decker Square. It was later renamed after Irishman Henry Ellis (1721-1806), sixth colonial governor of Georgia. Of the 22 squares in Savannah, this is one of six on the northernmost row. The northernmost row is closest to the Savannah River. The river is only a few blocks away. This general area, between the river and south to Liberty Street, is touristy. It's all a part of Savannah's North Historic District.
Savannah's historic City Market, opened in 1755, borders this square to the west. You can't miss it: https://www.yelp.com/biz/city-market-savannah read more