If you are trying to keep the commute to less than a half hour to Fair Oaks, you might want to look more at Cameron Park and Shingle Springs than Placerville. Placerville is pretty, but its probably more than 30 miles to Fair Oaks and when you throw in traffic across the Sunrise Bridge, you aren't going to make it in under a half hour.
But you might find some thing in Shingle Springs or Cameron Park that might work.
For information about 4H in Placer County, try here.
Placer-Nevada Counties - Placer County 4H Newsletter
If you are interested in country living, where you would probably get some really good information is at a local horse show. At a local horse show you will meet a lot of people who own 5 acre plots and they can help break down the costs and what are the considerations of things to look for. Often the shows are sponsored by people who sell stuff to horse people, horse trailer companies, real estate agents who specialise in horse property (meaning 5 acre + property). The weakness of this site as far as you are concerned is that it has too many people who live in the urban and suburban parts of the Sacramento region and not enough people who live in the more rural parts of the region. Thing you can do to get more out of this site would be to search the archives for stuff on Placerville, Cameron Park, Shingle Springs and possibly horse property. You also might check back several times in the next week or so to see if anyone from a more rural area actually posts on this thread.
You can find some of the horse shows in this area here.
MURIETA EQUESTRIAN CENTER Schedule
You might also look into horse property in either Orangevale or Carmichael. You can find larger properties off California and Garfield Avenues in Carmichael and again off Oak Ave in Orangevale. This would be a lot closer to where your husband works in Fair Oaks.