I find that above 80 km's my happiness and distance are inversely proportional. I can 'push myself' and do 125 km's, but then at the end I feel rushed and like I didn't really get a 'feel' for where I was.

I find that riding with partners slows me down significantly, but that's the beauty of it. They tend to remind that it's not a race to get from point A to point B ASAP, but that's it's all about enjoying each moment!