That's as many as last year's record field. Last year at this point, we were at 5,800. The new Papa John's Flying Pig 5 Mile has drawn 1,200 runners so far. Do enough work to keep your blood flowing. If you err, err on the side of caution and keep your training light.
Hydration is a major key.
Don't simply hydrate the day before. It's a good idea to drink at least 8 ounces of water or replenisher eight times a day. You may feel like you are putting on a little weight the last week or two because you are tapering. This is natural. Don't try to back off your intake too substantially, or you may suffer late in the race.