Ovinomancer
No flips for you!
Aren't your players going to say "I turn into a more typical housefly-eating spider"? I don't remember a minimum size on 5E wildshape but I might be forgetting it
What does a "more typical house-fly eating spider" have for stats? Do you, as a player, really want to have me stat up a "typical house-fly eating spider?" Okay, sounds like a strength of 0, dex of maybe 5 (my less than perfectly coordinated but still gorgeous wife has no real problem ending spider lives with a well wielded footware as an improvised weapon, so it can't be very high at all), a con of 0, 1 hp, 7 AC, and a move of 5'. Now, are you really saying that you want to turn into this spider and conduct a slow recon of the area of interest while everyone else here waits on you?
Nah.
You can turn into the spider, and you can do your recon. My guess is it will take many hours to do even a quick scurry through the dungeon. So, here's what'll happen, I'll run for everyone else while you go on for a few hours, and we can resolve this whole thing through a moderate INT check -- succeed and you get the layout and general inhabitants. Fail and you get the layout and general inhabitants, just jumbled a bit. Oh, and I'll roll the check behind the screen. Sound good? Great! You set off on your grand spider adventure. What do the rest of you do?