It doesn't matter what gender you are, if you are friends going hiking then it sounds like you will have fun. Only you can make it awkward.
Awkwardness is a weird one - A person MAKES the situation awkward by thinking it will be awkward, and thus acting awkward and making the other person who was probably fine in the first place feel awkward as well. Do Not even contemplate going hiking with the girl if you think you are going to act like this.
However, Awkwardness is easy to keep away if you know how. Just refuse to get nervous around her, she is just a normal person like yourself

Also, you should really learn to keep the conversation moving, If things get strangely quiet then ask her about herself - people LOVE talking about themselves. Ask her about her family, her friends, gossip with her, her schooling, her work, her hobbies, her talents, her pets, her favorite foods, talk about hiking, and how beautiful the area is...
Good Luck, I think you shall be fine
