Originally named after Frank Watson, a British trapper, Watson Lake is the first town in the Yukon on the Alaska Hwy and is just over the border from British Columbia (BC). It's mostly just a good rest stop, except for the superb VIC, which has a good museum about the highway and a passel of territory-wide info.
The town is famous for its Sign Post Forest just outside the VIC. The first signpost, 'Danville, Illinois,' was nailed up in 1942. Others were added and now there are 72,000 signs, many purloined late at night from municipalities worldwide.
Some 136km west on the Alaska Hwy, past the 1112 Km marker, look for the Rancheria Falls Recreation Site. A boardwalk leads to powerful twin waterfalls. It's an excellent stop.