You can get here by canoeing or taking a boat and then hiking or biking 28km to the site or you can hire a local helicopter company to take you there. I'd recommend BC helicopters for this but if you are going to take the longer route, see the link attached.

It's a super remote hotspring that you have to go to at the right time of year (later in the spring or early fall) because if you go early spring, then the hotsprings can be flooded out from all the water coming off the snowmelt. You also want to go during the day to get the amazing blue light illuminating the water. Be forewarned since this has gotten more popular, you may fly there to find another group there as well which can be frustrating but it's a risk you take.