Dogs should have access to a completely fenced in play yard with a 6
foot high fence at the very least - 8 feet height would guarantee no
dogs jumping over the fence. If there’s anything the dogs can climb on
that’s near the fence like a dog house, trash can, or benches they’ll
use that for their private launching pad. An 8 foot fence eliminates
any need to worry.

A very simple set up can be seen at this website:
http://www.bedandbone.com/

Your outdoor amenities should include plenty of balls, sticks,
frisbees, rope toys for tug-o-war games, etc. You’ll want equipment
in the yard for fun and exercise such as playground doggie jungle gym
equipment, durable toys, a challenging agility course, kiddie or
wading pools filled with fresh water for splashing (in the summer), a
doggy ‘loo’ fire hydrant, fun tractor tires for the dogs to run and
play on, A-frame to walk up and down on, sand boxes for digging, etc.
Some centers provide furniture for dogs to climb on, and many have
tunnels, and other equipment for dogs to hide in, run through, or
climb on. A tired dog is a happy dog!

Doggy care isn’t just fun and games, although it’s definitely a
priority. Dogs days are also structured around naptime and dog
protocol: playtime will always be supervised and time-outs given when
necessary for those who don’t comply with the rules.

Provide shade or covered shelters outside so the dogs are protected
from heat and rain.

The outdoor yard is asphalt, isn’t that hard on their paws?
http://www.tails-a-wagging.com/main.php?navarea=FAQ+Doggie+Daycare

“The larger area is asphalt, although this is a hard ground it is
actually a recommended ground for outdoor yards in Doggie Day Care’s
because it can be cleaned and sanitized. Grass would turn to mud and
be impossible to clean if internal or external parasites were brought
in. The outdoor yard is fully fenced with 6 foot chain link fence that
is secured to steel poles embedded into the asphalt ground. Our
indoor play area is covered with wall to wall rubber mats for
cushion.”

I doubt if sod would be a wise investment. Be sure to water down the
grass on a daily to keep it clean. Indoor and outdoor surfaces are
kept sanitary using disinfectants regularly used by kennels. Kennels
ideally should be disinfected every day with any waste that happens
cleaned up immediately. All bowls and utensils washed prior to every
mealtime and bedding checked at every opportunity. Primarily the
challenge to catching disease is taken care of by vaccination. But
you’ll need to make sure you have no infection by stringent cleaning
and disinfection. Use only veterinarian approved disinfectants in
kennels and in the right quantities.

Many facilities have a section of grass, section of pea gravel
(walkway for staff or dogs), and a section of asphalt.

Fresh water is always made available to the animals.