I would think of keywords, and use the emoji search on my keyboard to search for those, picking appropriate emojis from the results 👍
It can be multiple emojis, like add a car since it's a car park. Anything that stands out, you tag it. nostr:npub1m64hnkh6rs47fd9x6wk2zdtmdj4qkazt734d22d94ery9zzhne5qw9uaks is great at that. I would take a look at some examples that contain multiple emojis just to get an idea. But there's no right or wrong way to do it.
Discussion
Hmm, I might get into it. Good use of commute time on the train