I wouldn't worry at all about visiting California. The US unfortunately does not have healthcare which everyone can access, so homeless folks and lower income folks are unfortunately not able to access care in many circumstances and thus can suffer from diseases not often seen these days when people can access care. People interacting closely with those populations without following proper protocols are at higher risk of contracting the diseases they are suffering from. Follow basic hygiene protocols and you will be absolutely fine. California is not collapsing into dysfunction any more than the rest of the country, promise. San Francisco is a beautiful city with a very interesting history and is significantly cooler than the other places you are visiting. It's hillier and is known for fog. LA I personally find stressful and chaotic but that will depend on your feelings and where you go, of course. California also has redwoods, which I have not visited yet, but you should absolutely see some redwood trees if you have the chance!
I'm not sure if this is the case in the UK, but while none of the cities you're visiting would worry me at all, in any large city in the US it is advisable to pay attention to your surroundings and keep your important things on your person when in public. If I'm going into a situation where higher chance of pickpocketing is likely, I don't keep my wallet in my back pocket and instead keep it in a bag, which I watch at all times, or severely pare it down to a prepaid debit and my ID and keep it in my front pocket, so I"m more likely to notice someone going for it. I don't think that's a huge risk anywhere you are going, but if it is a concern, that's something to consider.
Last edited by Greyscale : 05-06-2019 at 08:19 AM.