This campground is well worth the 20 km drive from Merritt. It is beautifully situated on Monck Lake with well-spaced treed sites. It's clean and very quiet. This campground makes an excellent night's stopover when traveling the Coquihalla between the Vancouver area and Kamloops.
Don't stay at this park under any circumstances! The park is located right next to a train track and high speed trains roar through every 20 minutes all night long, loud enough to wake us up every time. When the 6:20 a.m. train went through, we gave up and left. The garbage dumpsters were overflowing the weekend we were there. The tiny beach on Shuswap Lake is dirty and covered in a slick of oil and gas from the many motorboats. This place is among the worst we've ever stayed.
We've stayed at this RV park many times in the past, both in winter and summer. The good news is that it is open in the winter and if you have a winterized vehicle, you can stay there while skiing. The bad news is that it's expensive (RV parks usually charge $30-35 in BC) and that the facilities, such as the washrooms, are increasingly dirty. On our most recent stay, I advised the front desk that the washrooms were "disgusting." There were clumps of hair on the shower floor and in the sinks. She told me she would have the cleaners see to it right away. Several hours later, and the following morning, nothing had changed. On a visit last winter, another RV'er we know complained and there was no response. Although there are no other RV choices in Whistler, there are two good provincial campgrounds nearby and we would stay there instead, if we didn't need to be in the town.