Personally, I think the easiest and quickest way is to take the boat launch to the FW marina. It is about a 1/2 mile walk from the marina to the campfire, or you can take the orange bus from the Settlement depot which has a stop at the Meadows trading post close to the campfire area. You can also take the yellow bus, which will stop at the 1500 loop bus stop and cross over the pedestrian bridge to the campfire area. Do NOT take the purple bus, since that only goes to the cabin loops and will take you no where near where you want to be. I actually think it is quicker to walk from the marina than wait for a bus.