We took the Hollywood Sign Adventure Hike and were overall disappointed with our experience, although it was great to see the sign up close and do something a little different to the normal tourist trails. I have emailed the company directly with my concerns but I haven't even had an acknowledgement from them in nearly 2 weeks.
Firstly you don't need to take this tour to walk to the Hollywood sign (hike is a little bit of an overstatement if you are ok with walking up hills - the UK is full of hills!). All you need to do is get to Lake Hollywood Park and pick up the path from there. We were there at 8am on a Saturday morning and there were already several other people walking, and lots more by the time we finished, so you are unlikely to get lost.
I don't know whether it was because we were the only ones on the tour but our tour guide wasn't very engaging. She was interested in flowers and seemed more interested in taking photos of these than the tour. As it's not something we are interested in she didn't have much else to say. We also pointed out a few landmarks and asked what they were but she didn't seem to know that either.
Overall the entire hike took just under 2.5 hours, and that was with coming down a different way. At the end of the tour, which is in a fairly quiet residential area, we needed to get an Uber. When I managed to get a cell phone signal there were none available. With that an Uber car pulled up and our guide jumped in and left. Bear in mind we were from the UK, without transport and staying in Santa Monica I don't think it is very professional to leave us in the middle of nowhere not knowing if we could get back, especially as the tour hadn't overrun. Luckily after about 5 minutes we managed to get a lift ok.
Overall this was not good value for money, just take the walk yourself.