Kingsmeadow Stadium, Jack Goodchild Way, Kingston Road, Kingston-Upon-Thames, Surrey. KT1 3PB. (telephone: 020 8547 3335)
Kingstonian has enough room for 1,600 away fans (shouldn't be a problem for a friendly then!), and a small car park at the ground. For food and pubs there's the town centre close by - there's also a chippie nearby.
The following directions are from the K's Web website which has more information useful for away fans and is well worth a look if you're making the trip.

By Car:
If travelling from the M25, exit at junction 10 (the A3) and head towards London. If travelling from London head towards A3. From both these routes exit the A3 at the New Malden Junction and head towards New Malden (left turn if from the M25). Turn left at the next roundabout (The Fountain) and you are now on Kingston Road (A2043). The ground is in "Jack Goodchild Way" which is before you reach the town centre, but a few miles along the Kingston Road. If travelling from Kingston Town Centre, then negotiate the One Way System to head towards New Malden via Queen Elizabeth Rd, then London Road, then right into Cambridge Road towards New Malden. This is the A2043 which then turns into Kingston Road. Kingsmeadow is on the right, just after a parade of shops.
By Train: The nearest station is "Norbiton" which is on the Kingston line and is served from Waterloo once every fifteen minutes on Monday - Saturday. The ground is a mile walk from there. Head towards the main London road (the main road near the station) and then turn left into Cambridge Road after the supermarket. It is about a ten minute walk up this road, with the ground on your right.