We stayed at Lake Martinez for three weeks in February '08. If you are looking for ice cream socials and shuffle board you will not find it here. If you want quiet camping and great fishing with quail and bobcats wandering through camp and coyotes singing at night then you have found the right place. Yes, it's isolated and about a 25 minute drive to the commissary/gas station/cafe/laundry at Yuma proving ground. No, that wasn't a problem for us, if it would be for you, don't camp there. Yes, some of the spaces are a little small. Some of them, read space #17 especially, are primo but you need to check with reservations to see what's available. No, there are no sewer hookups but there is a dump at Fisher's Landing about 2 miles down the road. Overall, I thought it was outstanding, the wife, not so much. We will be back next winter.