Sorry to get your hopes up. This isn't a map 𝘺𝘦𝘵. Only a still model. I've been considering making this a map for a while now but i am absolute garbage at the Valve Hammer Editor. Expect a update soon as i am going through a lot of my old work and finally enhancing it.

I meant how do I play this in the game

You can find this model in the Garry's Mod Spawn Menu. Click on "Addons" at the bottom of the spawn menu, and look for Moes Tavern (The Simpsons Hit and Run).

where do I find this?

My god.. It is beautiful.