Omiyakotsu Park is very definitely off the tourist track in Kyoto, and is a bit of curiosity. It's basically a go-kart track in which kids (and adults) can 'race' around a streetscape which includes traffic lights, roundabouts, pedestrian crossings, etc. It's certainly not an essential on anyone's itinerary in Kyoto, but if you're spending a week or more here (or you're living in Kyoto) and you want something a bit different to do with the kids, I'd certainly recommend it.
The park is in north-west Kyoto, at this location http://g.co/maps/9xa67. It's in roughly the same part of town as Kinkakuji (Golden Temple) - we got from one to the other in about 25 minutes, but it did involve changing buses en route. If you're coming from the city centre, the number 46 bus drops you pretty much at the door.
The set up is a simple road layout with dual seat (for little kids, who ride with their parents driving) and single seat (for 7+ years old) go-karts to drive around. Almost every kart was different, but they all basically looked (and sounded like!) mini racing cars with lawnmower engines attached! Tickets are 200yen (for a single seater) or 250yen (for a dual seat) car, with three of each being ¥500 and ¥600 respectively. Each ticket entitles you to a single trip round the circuit, which takes less than five minutes - so the purchase of multipack tickets is recommended!
Our six year old absolutely loved being driven round the track by his dad. Having 'real' traffic lights, etc, on the circuit really added to the thrill. If he'd been slightly older I'm sure he'd have enjoyed driving himself round too. In addition to the racetrack, there are lots of playground toys in the aprk - climbing frames and the like. There's also and old steam engine which you can clamber over, and a couple of old Kyoto trams which are full of kids books to read - all in Japanese, of course.
In fact, the park itself is entirely Japanese - no English spoken by the staff, and no English signs (even on the toilet doors). However the tickets are sold from a vending machine (of course) and the two second 'driving instructions' I was given didn't need any verbal communication!
Surprisingly, there's no café on site, or source of food nearby other than a Family Mart. However on the warm spring day we visited there were lots of local families picnicking on the grass in the park, so make sure you bring some food along with you. There are plenty vending machines for drinks and ice cream at the park.
Opening hours are 0900-1630, but the day we were there they closed at 12 for lunch.