The "meaning" of a tattoo doesn't need to be literally linked to the visual objects depicted in it, unless it's very important to you that strangers have the opportunity to try and understand your vision.
Any tattoo that reminds you and your girls of those memories will fulfill the purpose of displaying that artwork. If it were me, I wouldn't worry about trying to find the right '1 large, 2 small' objects as much as coming up with any camping scene (or any scene that reflects the vibe) that reminds you of those encounters.