Taking my ATV to Alaska? Is it worth it?

Hi, I would like to know if it is worthed to bring an ATV to Alaska, as well as using it in Yukon and BC.

Is there many trails?

Are you allowed to drive on some roads, on the shoulder, or in towns like they do for example in Quartzsite?

I wonder if I could go up to Salmon Glacier with an ATV from Hyder?

Thanks for your inputs.