"Hamburg is also a hidden gem of a city, so don't sell it short! Bremen is fabulous--one of my favourite places--but it is fairly small, and obviously Delmenhorst, while cute (yes, I've been), is even smaller. 4-5 days is a long time there, depending on what your relatives want to do with you; I could easily see them suggesting a day in Hamburg!
You've gotten good advice so far, and my thought is always: It doesn't hurt to ask!
Also, the DB is pretty easy to navigate. You'll be fine."
Hi HowlinMad, I figured that Hamburg likely has a ton of things to see and do given its historic background as a Hanseatic League city, being the 2nd largest city and largest port in Germany. I'm just not as familiar with it but I suspect the RSE guidebook that I will be receiving will have some helpful treatment and details on Hamburg so I will have some homework to do.
My initial focus on Bremen/ Delmenhorst is because of the family history ties to the area. My grandmother and her extended family grew up there. She would share some great stories about living there, including about kindnesses shown by individual soldiers towards the then-starving civilian population (due to the lingering effects of the wartime Royal Navy blockade of German ports) during the British occupation that started in 1919 after WWI and the unstable living conditions in the Weimar Republic. My grandmother was the last of her sisters to immigrate to the U.S., departing in 1927, before Hitler and the NS government came to power in 1933 and the start of WWII in 1939.
Of the siblings that remained in Germany (two brothers and a sister), the sister died during a mid-day Allied bombing raid of Bremen in November 1943 while at home having lunch with her husband. Their 18-year old daughter (mother to my 2nd cousin that I have recently connected with) was spared because she was away working at a factory at the time. So there's a lot of family history attached to the area. It is with a personal attachment that I will be spending time walking the streets and seeing the places where my grandmother and her family grew up, a surreal experience with echoes of ghosts from the past. It is just something that I need to do and my grandmother would be very pleased that I made such a journey.