I agree with Sweetpea that there are both regular taxis and mini-van type vehicles there. When recently visiting, we piled 5 people in a small sub-compact, 4 squeezed in the seats and one in the cargo area of the hatchback. I do not recommend this as the mini-van is the way to go. You will get there safely, although they drive quickly but they know the roads. Thank God for the two major speed bumps that are located on the way to downtown. Enjoy Chankanaab, it is definitely worth the drive. Excellent beach and snorkelling.