If you stay on the dirt roads any of the D/p tires,,, Carry a bottle of slime
and a tire pump, and do not air down the tires,, Unless you want dents in your rims,,,
A fun road is the paved river road between study butte on Presidio on 170
Also the dirt river road between castolon and Rio grande village.
Also hit the visitors information desk up for stuff to do....
The speed limit is 45 MPH in the park and they give Federal tickets.
and all the Rangers have Radar.... You can buy the stuff from the illegal Mexicans coming across the river as long as the rangers do not see it on your bike or truck,,, Hide it if you buy it, They sell the same stuff at the park stores and area towns at a 500 % mark up....
I like going down road 2627 out of the park it dead ends but the road is worth it..
With a week in the park you will not even put a dent in the things to see and do,, Its a BIG place