Sunrooms S**k...
1. Is it on a slab or raised deck?
2. Is it going to be inspected? if so run...
3. If it is a wood deck your o.k. otherwise bring in the wiremold...
I just got rid of a sunroom contractor. there are few options that are legal to perform.these rooms are very labor intense to satisfy the N.E.C. However if there is wood flooring you can pop up at each receptacle to a surface mounted box (T11 with duplex receptacle and plastic plate) doesnt look that bad. for the ceiling fixture or fan there is usually a header in the insulated sunrooms that the contractor can leave you a chanel to run your 3 wire...
Good Luck...