There is a big car park at the stadium, but as virtually everyone has to go to the match by private transport it's full well before kick-off. This can lead to a long wait after the game if you end up being in the wrong spot. Cars also park along the nearby road which maybe a better option if you want to get away quickly.
The ground is outside Irthlingborough, alongside the A6, and just off the A45.
Wellingborough, which is about 15 minutes drive away, is full of pubs and is the best option if your travelling by coach to get a few pints down your neck before kick off.
Failing that, A couple of miles north up the A6 from Nene Park there is the Dolben Arms at Finedon, a couple of seasons ago when the Stags took in excess of 1000 to Nene Park, 3 coach loads pulled up at this pub, and quite frankly the bar staff ran for cover.
£16 Adults, £11 Concessions to access Nene Park