Holiday Inn Express has a shuttle, it is shared with the Hampton Inn next door and the Hampton Inn signage is more prominent on the outside of the bus. The shuttle runs every 30 mins most of the day.
The pickup point is on the main roadway outside the terminal, next to the parking garage. When you get outside arrivals walk through the sea of people asking if you want a taxi, cross the road and turn right, walk along a bit to stand under the first walkway connecting the parking garage to the departure hall, protects you from the rain and/or sun. There is no sign saying hotel bus pick up or similar, just wave down the bus when it comes.
If you go to get a taxi they will tell you to get the shuttle as they don’t want to make a short trip, there are looking for a passenger for downtown.
Once on the bus the driver will ask you if you have a reservation, you have two choices, lie and say yes, or be honest and say you are getting Interbus. If you are honest the driver will start telling you that the shuttle is for Holiday Inn/Hampton Inn customers only, at this stage an early tip of c500/USD 1 per bag/person will help the driver focus on driving. Either way do tip the driver when you get off.
If you walk around looking lost it is likely a helper will come, this is a helper not someone looking to steal your bags, who will ask you which shuttle you want and even call the hotel on his cell phone to check the shuttle time, but he expects to be paid, again c500/USD 1 per bag/person.
So do have some USD 1 bills ready on arrival, the airport AMTs will give you c10,000 approx USD 20.
When you arrive at the Holiday Inn Express you can walk over to Denny’s who will welcome you as an Interbus customer, let you sit until the bus comes, as long as you order something. Denny’s menu is pretty similar to the US, but includes Gallo Pinto They will even give you a traffic update and likely delay for your bus. There is outside seating in the Denny’s entrance area and the covered driveway of the Casino (same building as Denny’s)
In most cases the Interbus driver will come inside Denny’s looking for passengers.
Around the Denny’s/Holiday Inn Express area there is not much. If you want to get cash, snacks, SIM card, postcards, etc. get them inside the arrival luggage area or walk into the departure area, upstairs, and get them before getting on the shuttle.