Matthew takes Bunny out for her 40th birthday somewhere she has never been, there were hats promised.  

The mystery game: https://www.unsolvedcasefiles.com/

The hat "museum" https://www.atlasobscura.com/places/a-century-of-hats

Antiques:   https://www.wrightsquarevintage.com/

http://www.davenporthousemuseum.org/

https://www.telfair.org/visit/telfair-academy/

The book about the body farm is actually: Death's Acre: Inside the Legendary Forensic Lab the Body Farm Where the Dead Do Tell Tales