If you are worried about the roads, don't be. You might want to set off at the crack of breakfast to enjoy the ride before the tourists arrive in their coaches. Forward planning would help to identify the viewpoints where you can stop to admire same. If you are not prepared you could 'overshoot' the small number of parking spots.
Lluc monastery is a very pleasant break in your journey.
If you are not keen of mountain roads avoid taking the right turn to Sa Colabra, or the OMG
road. However, it is great to be able to brag that you made it to the bottom and, importantly, all the way back up – the road is a cul de sac. Sort of once you have started you have to finish.
Don't know of current situation in Soller, but drive into Port Soller at your peril. Parking is available but very difficult to find and because the 'front' is now pedestrianised traffic is reduced to fighting for space on the small back streets. Once more forward planning would be helpful.
There is parking beyond the backstreets if you can make it to the waterfront at the far end of the port.
As you approach Port Soller from Soller you are faced by a (free) tunnel that takes you around the back of P.Soller. Its exit deposits you in the aforesaid back streets.
Maybe someone will be able to confirm this, immediately prior to the entry to the tunnel there is some car parking on the left. If we hadn’t been drawn into the tunnel by the line of traffic we were in, maybe we could have explored that. Would have saved a lot of stress.
An alternative way to Port Soller is to park in Soller and use the tram.
The easy way back to PP from Soller is towards Palma via the tunnel (not the tunnel into Port Soller) and pick up the motorway. You don’t have to retrace your steps over the mountains. Have your credit card ready for the toll booth. Cost earlier this month was 5.05 Euros.
Despite a bit of doom and gloom above, Lluc, Sa Colabra, Soller and Port Soller are well worth the effort to visit.
Another possibility is to drive to Bunyola, and take the train to Soller and thence the tram to Port Soller.