Open Monday through Wednesday, from 11 a.m. to 9 p.m., Thursdays and Fridays until 10 p.m.; Saturdays, 5-10 p.m. and Sundays, 5 p.m.-9 p.m. American Express, BankAmerica, Master Charge, Diners' Club. Reservations not necessary.

There is an unlikely little place in Vienna that all family restaurat goers shold know about. If you drive off Route 123 on Park Street for about a mile, you'll find an everyday-looking shopping center on the right by the name of Cedar Park.

Tucked between Suburban Savings and a hair-do store is a doorway marked Cedar Inn. Why anyone would know that it's a family eatery is a mystery, but the four of us were acting on a native's tip and it was a good one.

Inside, the light was subdued. There were many familes with children, but somehow candlelight hushes like no high-watt, fast-food chain ever could.

There's a free do-it-yourself salad bar of remarkable proportions. Besides lettuce, there are chick peas, onions, bacon bits, shredded eggs, cheese, croutons, cucumbers, fresh French bread, butter and five dressings.

Our waitress proved ever so cheerful and attentive. There didn't seem to be a drink list, but son, 10, settled on a root beer and daugher, 7, on a coke. The adults zeroed in on a margarita and a whisky sour on the rocks.

Ordering the main courses was difficult, because there were too many ways to go: Pizza, for example, from $2.25 for a 9-incher to $4.95 for a 12-inch combination job.

There is a children's menu, too, with everything from spaghetti with meat sauce at $2.45 to charbroiled steak at $3.50, or hamburger at $1.95. For big people, there was a daily special of ham steak with potatoes and salad at $3.25 or fried frog legs and salad for $3.75.

Our daughter chose spaghetti with meatballs at the children's price of $2.85 - and the portion is for a decidedly large child. Son went for an adult's order of golden friend shrimp ($4.75). In each instance, the rave notices were ratified by parental tastings.

My wife, with veal parmegiano ($5.75) and I, with club steak ($5.95), were quite pleased. We were also intrigued by the extraordinary number of other tempting dishes often shishkebob at $5.95; beef burgundy bits of $4.95; veal, poultry and ham dishes from $4.75 to $5.75 and, if you give them 24 hours' notice, cheese fondue for 4 at $5 per person.

My wife and I decided to let dessert be a spectator sport. We watched our son devous a large slice of lemon meringue pie and our daughter gobble up chocolate eclair.

Our bill for it all, $26.76 plus tip, arrived with a handful hard candies for the kids. It was autographed by Carol, who had been friendly beyond the call. Somehow, she created the occasion to which our children rose.

Open Monday through Wednesday, from 11 a.m. to 9 p.m., Thursdays and Fridays until 10 p.m.; Saturdays, 5-10 p.m. and Sundays, 5 p.m.-9 p.m. American Express, BankAmerica, Master Charge, Diners' Club. Reservations not necessary.