This is a must!! I’d recommend doing it before anything as it lets you see exactly what’s on offer and where you might want to explore more. Fremont street stop was amazing and you get about an hour there which is plenty of time to see it at a glance. The guide was very knowledgeable and funny and it was great to see the lights of the strip too! When you’ve booked, make sure you get there 30-45 mins before it starts as the line gets really big really quickly!!