I believe Munich is filled with migrants, but other smaller cities/Towns should be great.
I saw a video recently of Oktoberfest and everyone there was native German, no migrants at all. So in some parts of Bavaria it's pretty chill.
If you can afford it, I'd advise you to visit Berchtesgaden. It's where Obersalzberg is, a.k.a Hitlers resort. His Resort nowadays is a big tourist destination. The town itself is marvellous. Just google the images and you'll see.
it's a little sad that someone who is only "Germanic" through his Anglo side appreciates this more than many Germans nowadays, completely mindbroken after WWWWII.
I don't see English people as particularly different from Germans. To me they're just German Islanders. I've been to Britain a few times and the people were awesome, the culture was very familiar to me and the people could all pass in Germany.
What I love most about English people is their posh accent and culture in certain areas. Haha kinda funny how you as an English descendant love Germany, but me as a German love England.
And about the mind broken thing: Schools don't even teach us our own history. In my school we had a class called Gesellschaftslehre and in it we only spoke about ww1 very briefly. The Teacher told us that Kaiser Wilhelm wanted to conquer the world and this was her jump off to ww2 where the absolutely crazy maniac Adolf Hitler tried to conquer the world again. Ridiculous joke of a history lesson. I remember when our teacher (she was an alcoholic foid btw, sounded like a walking cigar) told us that if any foreigner ever visited Germany, an SS dude would be standing on top of a rooftop, ready to blast his brains out. It is the most ridiculous shit you've ever heard that is being taught in German schools.
I have a very old sounding surname if that makes sense. And the teacher would call out my name and use it for weird Nazi re-imagining in which she'd explain how SS Truppenführer (insert my name) would have dealt with certain orders, or killed certain ethnic groups. I told my parents and after we talked to the principles it stopped. But still. Its fucking annoying.
Many teachers would also pick out the stereotypical Nordic looking person and say shit like "This dude is Hitlers favourite". Oh what I forgot to mention was that many Germans heavily emphasise the idea that Hitler was a foreigner and a non German, due to his Austrian roots, which is laughable at best. Austria is one big propaganda country and shouldn't even exist. Austria and Bavaria share dialect, culture, looks everything. There's 0 difference, which is why Austria wanted to join Germany in ww2. Austrians are Germans. It's retarded to say otherwise. Österreich it's called in German, which translates to "Eastern Empire" btw.
What my point is is that school inherently makes us ashamed of our history, dims it down to only ww2 (and a very simplistic view of ww1, which is literally ally propaganda) and if you say something against it you get suspended. This shit starts at Kindergarten. Even Christian Kindergartens aren't safe as I attended a protestant one and they taught us very weird shit too from early on.
So yeah the average normie German will fall victim to self hate etc. The only germans that are more resilient to this are people with Eastern origins. Poles are probably the biggest nationalist group. Eastern Germans, who migrated to the west are as well.
Anyways just be careful not to go to the big cities for long. I've seen weird street dealer shit as well where you get robbed by Niggers, just like in Italy. It's not fun at all and will sour your mood.