Hey Rob! Hopefully I'm not the jinx here, but... I've been on 6mp long term since I was a kid, except for a three year remission a few years back. Anyway, in my teens/early 20s I would get a horrible rash from the sun - bright red blochly - and my dermatologist was pretty sure it was from the 6mp. So I had to wear pants/sunblocking long sleeve shirts outside. After I started the 6mp again in '09 I got the rash again after being in the sun, but not as bad. But then it stopped - I haven't had it for months.
Anyway, just a heads up - hope this doesn't happen to you, but if it does there are some lines of clothing specifically for sunblocking protection that help.
Also - and I think this is true for the aza, too - I was told that for the 6mp, the side effects are much more common is the high doses used for other treatments (chemo, organ transplants, etc). The doses used for IBD are "low" in comparison, and therefore the side effects usually aren't as bad. Hope this holds true for you!