You probably know all this from past threads..but anyway.

My un vacced kids have both had mumps. They were about 2 and 3. I just kept them cool, plenty of fluids and away from everyone else.
To make sure it WAS mumps I did take them to the doc, but I called first and asked that an area was provided for ds to be alone. We whipped him straight through to that room. Oh how I HATE playrooms for kids in Drs rooms!
DD showed signs about 12 hrs later.

It was over fairly quickly though, they weren't too uncomfortable and had plenty of jelly to ease the fever.
Their temps didn't go too high though, not scary high but I did let them go as far as I felt comfortable before I gave them panadol. I don't like to interfere in their own immune responses.

The dr seemed really panicky and didn't know much about it - I spoke to the Health Dept (as needed as Mumps is reportable) and the lady was more than happy with the way I was handling things. She did ask about vacc status but didn't give me the 3rd degree or anything.

DD has had measles. For some reason DS didn't catch it. The worst part was over in 3 days. Again, the care was the same as mumps but I didn't let her out into the sunlight for a week or so afterwards and during.