Get those hills in! ;-)
Male sure you give yourself some good rest after a hard run like that, so your legs can fully recover. That's always my biggest fault - doing a hard run and then doing another one straight afterwards.
Having worked on building sites in the UK back in the 90s, I'm not surprised by the cracks. There were a few houses I worked on that I was surprised they were still standing at all.
Just be glad you don't get earthquakes over there ;-)