Stay under 5mg. Wait at least 4 hours before taking a second gummy. The general tolerance for edibles is lower than smoking. Edibles also last a lot longer and hit harder than smoking.
Definitely don’t drink while high as I would not recommend it unless you were staying put in one place.
Try to follow the crowds; let the locals and other tourists make the first move crossing the streets and crosswalks.
My impression of the cops there is that they are very strict if you’re stumbling around being a danger to the drivers and tourists. Being impaired in Vegas on the street is kinda tolerated since it’s an open container legal place.