We will be in STR at the beginning of July and also want to do a Porsche factory tour. The website says that tickets will be available in April, so I emailed to find out when exactly. I was surprised to get a response saying that they don't know and to just check their website every day, beginning at the end of March.

Also, any STR hotel recommendations? We are there for 2 days - one day hopefully at Porsche and one day at the Mercedes museum.