Below are some directions that Andy found out there and here is the address for the resaurant. Meet at the restaurant at 8:00am or the Los Coyotes main gate at 9:30am.
The restaurant is on the corner of the 79 and the 78. Here's the address so you can pull it up on a mapquest or something:
Apple Country Restaurant
30270 Hwy 78
Santa Ysabel, CA 92070
To Los Coyotes
DIRECTIONS
From Los Angeles -- Take I-15 south to Temecula and exit Highway 79 South (be careful to not use 79 North). turn left under the freeway and proceed to the small community of Warner Springs. You should top off the gas tank in Warner Springs. After topping off the tank, proceed another 100 yards, or so, to Camino San Ignacio (there is a sign pointing to the reservation). Turn left onto Camino San Ignacio and proceed about 8 miles to the gate. You can air down at the gate, or you can proceed another 3 miles to the main camping area and air down there.
From San Diego:
Take I-15 north to Scripps Poway Parkway east Follow until it ends at Highway 67 turn left (north) You will enter into Main Street in Ramona (this becomes Hwy 78 east). This is a good spot to eat and fuel-up. Follow Hwy 78 east into Santa Ysabel and turn left (north) on Hwy 79 towards Warner Springs. (Dudley's Bakery is a must stop!) You will travel for about 12 miles until you reach San Ignacio Rd (just before you reach the gas station). Turn right (east). Follow this road until you enter the reservation and the main gate.