I saw this on Saturday but didn't have time to respond. Anyway, Westport is closer to Mercy than Fenton but not by much. Both areas are classic American suburbia. As far as where to fly, downtown may be prohibitive with the Arch grounds off-limits and the possibility of baseball but there's still other downtown areas: Soulard (Anheuser-Busch is there), Central West End, SLU campus, amongst others. The Arch may still be a possibility if you launched off of park grounds and stayed over the Mississippi River. As mentioned, Forest Park is one of the largest city parks in the country. It's actually larger than Central Park in NY. It's on the western edge of the city but you can still get nice vistas of downtown. There's a beautiful Mormon temple five minutes from Mercy Hospital. There's only 200 or so of those in the world. Non-Mormons can't access the grounds directly but plenty of places around it to launch from. Laumeier Sculpture Park (
https://www.laumeiersculpturepark.org) is closer to Fenton but only five or six miles from Westport. As the name suggests, it's a park with a lot of sculptures in it. Castlewood State Park is nearby (8 miles) with beautiful vistas of the Meramec River. St. Charles, MO is five miles from Westport, along the Missouri River with an old town area that would be cool to fly around. Thirty miles west of Mercy is Missouri wine country with a lot of beautiful vistas of the Missouri River and the wineries along them. There're other places, these are just a few I've thought of. BTW, I'm in St. Louis, actually in Town & Country like Brett (was). If you have any questions, let me know.