+1 Schreiber here. Inspection at CMP is a great time, and a lot of people enjoy it because of the interaction with new teams.
My jetlag experience is totally different east-to-west than the other way around, so I would say get in as early as you can and get your sleep schedule settled. Championships is, in a word, exhausting. There's a reason there's massages for the volunteers at lunch!
There's a team of us who assign for CMP. Volunteers at CMP are grouped one of three ways: Field, Pit, or Other, but we all share the same pool of volunteers. If I was looking at a profile like yours, the first question I would ask you is: How important to you is it to watch matches? That will split the list easily, depending on which way you go.
The second and third questions are tied together: What jobs have you volunteered for in the past? Do you want to continue doing them? Championship is really cool because there are different jobs that you won't ever get to do at a Regional, and you get to meet very different people. Don't be afraid to jump into something new, but as it was stated earlier in the thread, some roles require current year experience (Reffing, Inspection, Judging, etc), so if you have the time to get trained, do it!
If you want to know more about the jobs or the process, let me know:
jboucher@usfirst.org.