It definitely can be walked easily but in the heat it can feel like forever and then throw in their age. A taxi would be cheap. I think around 4 or 5 USD. Don't forget you need to factor in a taxi on the PDC side as well. There is a slight hill up to where you would catch another taxi to Xel Ha.
GET UP TO A $1000 SHIPBOARD CREDIT AND AN EXCLUSIVE GIFT!
If you make your Disney Cruise Line reservation with Dreams Unlimited Travel you’ll receive these incredible shipboard credits to spend on your cruise!