You take some great photos so you should do fine.
Here is some of my hard-earned basic wisdom:
Make sure you know how to use your camera.
Make sure your battery is fully charged and take an extra battery
Make sure the memory card in your camera is big enough and take an extra memory card.
Even if it's just a disposable camera from Wal-Mart - take an extra camera in case this one has problems. Getting 24 decent shots with a disposable beats getting frustrated with an expensive camera that picks the worst time to malfunction - especially after all the effort you are putting into this.
Here are some composition and technical tips from GrandCanyonhiker.com with some added commentary from me
These tips are about photographing the Grand Canyon, but most can be modified for your destinations.
"Think Small! The natural tenancy is to want to get the whole into a single picture. You can't. At best, you'll get a picture that looks like a mistake. Instead, focus on interesting details or patterns within the canyon itself. Your photos will be stronger and more pleasing as a result. Seek out small details"
"Shoot early or late in the day. The low angled magic light of morning and evening really brings the canyon to life. Colors are richest during those hours. Avoid shooting scenics during midday" (As Joel has already mentioned)(It helps to have an idea of where you want to be at what times.)
"Be Steady! Hold that camera rock steady with two hands. A firm grip will reduce blurred photos due to camera movement. My hiking staff doubles as a monopod. This arrangement saves weight and helps deliver extra sharp on-trail photos at a moment's notice. Even better, use a tripod. I often carry one. Yes, I'm also of questionable mental stability."
"Protect that Camera. Fine camera ruining dust abounds at the Grand Canyon. Dust storms are common. Keep a pair of zip lock bags handy at all times. If a dust storm picks up, double-bag your camera fast!"
"Use a Polarizing Filter. A polarizing filter is your secret weapon for reducing glare and getting ink blue skies. The canyon colors much richer, too. If your camera accepts accessory filters, invest in a good quality polarizing filter. Your photos will really look great!" (My Comment on this one - know how & when to use your CP filter. Too much and it will look weird or you will get too much vignetting in the corners, also consider a Graduated Neutral Density Filter).
And a final tip from Edward Abbey:
"Enter at your own risk. Carry water. Avoid the noonday sun. Try to ignore the vultures. Pray frequently."