Hello there, 
Me and a friend are planning a trip to Madeira in the second week of September. We would like to rent a car and make a roadtrip through the island. A hiking from Pico de Arierio to Pico Ruivio is surely a must! Would be nice to join with other adventurous hikers, with common sense, to share the adventure and the rental car costs with.
The period of the trip is unfortunately not flexible, as it's the only vacation week left in this year.

If you are interested let me know. 
Best regards, 
Cezara.