You are doing pretty good as it is with the point and shoot. Most point and shoots do a lot of processing themselves, which a real DSLR won't do or has to be set up to specificly do them... like adding sharpening or saturation or adjusting color balance.
With some of the examples I see here, I can see a couple of things you might want to look into using... one is a poloraizer filter and the other is a gradiant neutral density filter.
The polorizer helps bring out the sky and colors by reducing reflective contrast from the sun. Even when it's cloudy, a polorizer can do a great job of helping bring out the colors in objects.
The neutral density filter is good when you have a bright sky and a darker forground. If you expose for the people in the forground the sky will be over exposed and come out white. If you expose for the sky to get nice blue and fluffy clouds, then your forground is under exposed. A gradiant neutral density filter is darker at the top and clearer at the bottom. That way you can expose for the forground and light is reduced coming from the sky to give you a proper exposure for both (usually depending on the difference between the two). GND filters come mainly in 1 and 2 fstop differences.
These two items, if you get them and learn how and when to use them can help make some really good shots into WOW shots. They are small and easy to carry so won't take up a lot of room.
Something else that I can see would be a big help for you is a tripod and a remote control attachment for your camera. This way you can put your camera on the tripod with the remote receiver, go back to the family and as you ride towards the camera or past it, remotely fire the camera so you can get all of you in some of your shots. Having shots of all of you add something to the images and could mean more to you in the furture. Most cameras have remote triggers although you can also use something like the Pocket Wizards to remotely fire you camera.
There are so many things that you could get that might help, but of course you can only carry so much on your trips... unless you have someone in a car also along on the trip to carry some of your stuff. You can find out about what I suggested and see if any of them might be something you would want to learn more about and maybe use.
What ever you decide to go with, make sure you spend time learning it so you don't have to learn on the road.
Mike