I have visited the Teresopolis side of the park several times over my various visits to Brazil. Most recently I hiked to the top of Pedra do Sino (about 14 km hiking from the park entry), which is the highest point in the state of Rio, and stayed two nights at the lodge which is approximately 20 minutes before the peak.
The hike on the way up involves a 3 km walk through the park grounds to the start of the hike where it's a further 11km, which is reasonably steep in all sections besides a few flat stretches. Most of the hike is through dense forest though there are a few waterfalls (water is potable from the second on wards) and some lookouts.
The lodge is a very simple affair with bunk beds and tents for hire (or you can bring your own). There is no linen available and no blankets so you'll have to self-provide (it gets very cold here at night, even during summer). You'll also have to bring your own food as it cannot be purchased. There are basic cooking facilities. Accommodation can be pre-booked online (good luck as the pre-purchase option probably won't work) or at the entry to the park. The park is very busy during winter, especially on weekends, so it's advisable to book ahead at this time of year but outside this period you should be safe just booking upon arrival in the park.
The view from the top of Pedra do Sino is spectacular at sunrise and during the night, when the lights of Rio can be seen. There are also a few other side trips that can be done. Information is available at the lodge.
If you're planning on doing the Travessia between Petropolis and Teresopolis then bear in mind that the middle section of the track is almost completely unmarked and with many forks in the track so the risk of getting lost is very high.
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