Hello! For the First time I am traveling to Las Vegas for fun !  
Any hints or ideas while traveling to Las Vegas?  Things to Must See locations that aren’t on the strip?

Off strip restaurants, dive bars, hiking?

If it's your first time, you definitely should take the time to walk the different casinos at the strip.
They are out of this world. Fremont street is also quite interesting at night.  
Vegas has amazing restaurants and bars at the strip as well as off strip.  
If you like hiking, it might be a good time to visit Red Rock and Valley of Fire as it's not too hot yet.
Just to name a few...