I am able to impart two gems from recent experience:
1. Nymans garden in April is pretty much heaven on earth, especially if you like camellias and magnolias. Some pictures follow; out of interest - the house you see is not as old as you might think, this part was early 20th century. It was destroyed by fire in the late 40s.
2. Putting industrial quantities of couch grass into your compost bins over a 3 month period is stupid. I didn't know what it was. I do now.