Whilst I'm not sure about the 100m miles rule (for one the UK is not really big enough to make this viable and being able to go home is nice), I completely agree that you have to like the University and your course will only be as good as you make it.
Out of my six choices, I only wanted to attend one after visiting them, there was no way I was going to any of the others. I also found a lot of students very young and tiresome (although they were actually the same age as me) so being able to go home to some sanity was a blessing! This was particularly true when stuck in halls. My family didn't pressure me though, so I could go home if I wanted. When I had my own flat (well rented) I went home less, as by then you have real friends not the people you're dumped with and possibly a part-time job or sports club at the weekend.
Also, if you put in a lot of effort to your course, then you'll succeed. It's worth asking to meet the head of department or doing some investigation about the teaching staff, as they will be what makes the course good. I went to what is seen as a very good Uni, but the standard of teaching is laughable.Just try and get as much information as possible, it makes the choice a lot less stressful.
Also remember, it's not forever. It's actually very brief. If you've given one university a really good shot and you hate it, you can leave. I have friends who switched courses, some who switched Unis as their original choice was not working for them.
Remeber it'll be a great adventure, whatever!
Good luck deciding.