I took the cable car down with my 3 year old son (we walked up), and we looked forward to the views, but the queues are long, the staff are pretty rude, and you’re rammed in to the cars. It’s pure luck if you’re next to a window with enough room to get your camera out and take a photo. It’s definitely not worth the money (everyone over 3 pays). The walk up was really lovely - even on a warm-ish day in late May. There are also several buses that run you up to the Tower, which I’d definitely recommend over the cable car. I wish we’d walked back down.