Good deal! You will have fun at the lake with that puppy.
To rotate your pictures go into your photo library, rotate the picture then save it. Go back in and rotate it again to the proper position. Go back and edit your post and replace the picture.
I post everything off my iPhone. Any more before posting I just rotate the photo in my camera roll, rotate it, hit Done, go back & rotate to proper position, post. Have not had any issues.