With a maximum of 40 people allowed on the Thorsborne Trail at any one time, in groups no larger than six strong, the trail is never going to get overrun by trekkers. This is just as well, as the trail route is fixed and the park authorities ask everyone to stick to the track and not to wander off into the wilderness. There are just two other walking tracks on the island, but they're for day-trippers and don't come close to the wilderness experience of the Thorsborne.
The route is easy to follow, and heads broadly south along the east coast of the island. It's not all beach hopping, however, and there are plenty of sections through the rainforest and over headlands where wet weather can make the track slippery. You can get a leaflet from the National Park office in Cardwell than describes the route, and for most people this is more than enough to follow the trail. It's pretty obvious where you need to go.
The route I took followed the standard recommendation for a four-day, three-night visit. Here's the schedule that most people seem to follow:
|1||Ramsay Bay to Little Ramsay Bay||6.5|
|2||Little Ramsay Bay to Zoe Bay||10.5|
|3||Zoe Bay to Mulligan Falls||7.5|
|4||Mulligan Falls to George Point||7.5|
It is possible to stay an extra night on the trail, in which case it might be worth camping at Nina Bay, splitting the first day into two. Day 1 would then be a 4km walk from Ramsay Bay to Nina Bay, and day 2 would be a 2.5km jaunt from Nina Bay to Little Ramsay Bay. Alternatively you could stay an extra night in the other campsites; the days aren't too long on the Thorsborne Trail.