In 2011 and 2012, we spent July 4th in Seward. The first year we stayed at a Bear Creek Campground and it was the pits. http://www.bearcreekrv.com The second year we stayed at the Stony Creek Campground and with the exception of a very small laundry and shower facility, we found it to be quite nice. http://www.stoneycreekrvpark.com
Both of these are located 5-6 miles out of town which was fine with us because like some have already written, Seward can be a very busy place on the 4th. We really enjoyed watching theThe Mount Marathon Race and the parade. We also ate a BBQ chicken dinner from one church and pie and coffee from another.
Another plus with staying at Stony Creek is that there is an area within easy walking distance where you will be able to see many eagles. One morning my husband stood among trees where he counted 14 eagles at one time. Now you know why we will be returning. I would recommend making reservations for this one. There were quite a few caravans that stop there. It is the only place that we have made reservations for our trip this year.
We have also stayed at two different campgrounds in Homer. This is the one that is closer to town and on the beach http://www.baycrestrvpark.com. The other one is out a bit on a bluff http://www.karo-ent.com/oceanvw.htm. I would recommend either of these, but the spit is not for me---just too much action.
I have found this to be a good source for campground information and reviews http://www.rvparkreviews.com