Whether it's a good first date or not depends on the girl. You might wanna have a guiding activity; like taking pictures on your phone or something.
It 100% doesn't have to be autistically stuck to; the activity is legitimately just a placeholder for in case there's a lull in conversation. If literally any other idea develops naturally, that's a lot better.
Going on a walk up the pier, around the lake, etc could also work. I think you'll end up wanting to focus on converastion, pointing out cool looking stuff you see, etc.
Stay off your phone, don't dominate everything by taking constant pictures, try to focus on her and what she wants to do. If she's /out/ it's possible she'll have an idea of what she wants to do anyway.