When you leave for a mountain trip, you must make sure your legs are in order, especially the joints - ankles and knees. The hip joint rarely is a problem when hiking.
Always carry extra shoe laces. ALWAYS!
Be prepared for bad weather, since it can change in minutes up in the mountains
Hydrate. You can get heatstroke if you don`t drink lots of water/whatever you drink.
Have fun. You can walk all day and still have a fun and wild night. And you`ll get off cheap - 1 beer in the city = 3 beers after whole day walking.
Follow if you found that usefull - plenty more where that came from.