Culled from the Bostik League web site :--

If an away fan was travelling to your ground for the first time, how would you recommend they got there? Tell us about parking and public transport. Visiting the ground you will find there is more than ample parking by the clubhouse, in our car park, street parking on Chestnut Avenue by the allotments, or in dry weather across the cricket field in Highland Road. Coach parking is accommodated in Chestnut Avenue on the downhill side of the road from the access road. Never try to bring a coach down to the clubhouse:1) you won't get it turned round 
2) you'll never get it out onto Chestnut Avenue after the game.We had a huge laugh at one club who ignored this advice. Eventually they had to get some of our neighbours out of bed to move their cars in order to get the coach out. That did not go down well.Public transport in London is fantastic, except when your tube-line isn't running at the weekend. The closest stations to Northwood FC are the METROPOLITAN Line (the Maroon one) stations of Northwood, and Northwood Hills. The N.Hills station is the easier to walk in the drier months, there is a footpath to the left of the Namaste Lounge (former Northwood Hills pub). This leads out onto Highland Road where you turn left, follow HR downhill, round to the left, back up the hill and right into Northwood Park. The FC is visible across the cricket field. Note this route should NOT be followed after even moderate periods of rain. In the winter months the cricket field becomes bog-like.Best alternatives are, From N.Hills get the 282 from the stop across the road outside Nails & Co to "Northwood Iron Bridge" Turn right off the bus then turn left into Chestnut Avenue. From Northwood Station, get 282/H11 from the stop outside Lloyds/TSB Bank to "Hallowell Road" turn right off the bus, turn left at the end of the road, use Zebra Crossing, turn right into Chestnut Avenue. The H11 bus can be used direct from Harrow town centre or Pinner station too, just get off at "Northwood Iron Bridge".
And please note, The Bar is only accessible from outside the ground. The number of people I get through the gate then ask where they can get a beer is phenomenal!  
Are there any local sights or amenities you’d recommend they visit? Tourist attractions, pubs etc?

Unfortunately Northwood is set in the middle of Suburbia where nothing ever happens, nothing happens at all. Weatherspoons in Northwood (closed in 2008) and Northwood Hills (closed 2015) helped wipe out the pub trade in the local area before deserting themselves. Elton John was born in Pinner Hill Road, what was the Northwood Hills pub is where legend has it he first "tinkled the ivories." Food wise there is a plethora of Chinese/Indian/Thai/Pizza/fried chicken/kebab places to either sit-in or grab a take-away.