Hello, I live on the sunshine coast in robert's creek. Once you get off the ferry there is nothing for cyclists in terms of signage or recommendations which is a shame. If you go straight up the bypass it is a long intense slog. For your level or cycling I recommend turning left on Marine drive and biking into lower Gibsons. It is okay, not much of a shoulder. Once you get into lower Gibsons, you could have a snack at sushi nagomi and go up Gibsons Way which is long hill and steep for a bit, but okay. Follow Gibsons way past the mall and all the fast food places and it turns into the highway. There is a bike lane along the main drag in upper Gibsons.
Alternatively, if you have a map, you could take the long meandering way through Gibsons following Gower Point back up to Pratt Road which will take you to the highway which you will turn left at Mcdonalds. It is much flatter with only a few steep bits.
Once back onto the highway there is an okay shoulder until you enter Robert's Creek area. There will be an intersection and you can choose to go left on Lower Road. This I would take to get to Robert's Creek if you want to go down to the village. There is a hostel in Robert's Creek on Robert's Creek Road closer to the highway. there is also camping in Robert's Creek Provincial Park which is off the highway. You can also access it by following lower road which turns into Beach avenue past the village. Follow that to Park Avenue and bike up. You can go into the campground through there and find your way to the kiosk etc..
The highway going from Gibsons to Robert's Creek is okay. I do it daily and there is a bit of shoulder, in some spots you can ride on the dirt if need be, in other spots you are right next to ditches, lots of gravel, sand etc in the summer....and traffic! Not so enjoyable. I would recommend Lower road which does not have a shoulder, but the speed limit is supposed to be 50km, although people still speed. But to get up to the hostel or camping you will have to ride up some hills.
There is a bike lane on the highway going from Robert's Creek to Gibsons however which is pretty good for the way home.
I do not have a car and am used to riding here, but it's not the most fun.
I would say the highway is VERY busy-especially with the ferries and especially in the summer with plenty of logging trucks, dump trucks, big scary trucks which do not slow down for cyclists. I would not say the sunshine coast is very biking friendly, most people who might bike do not because they feel unsafe. However, do not let that discourage you, just be safe. The distance from Langdale to Robert's Creek village etc is not that far, I would say an hour and a half to 2 hours and a bit depending on the route and how much you stop.
A very nice spot is Davis Bay which is on the highway past Robert's Creek and Wilson Creek. It's all downhill to get there and not far from the campground. It's a nice big wide beach.