Long time ham here too and I love low power (QRP) operation but it isn't for wimps or beginners. Still, I definitely recommend it once you acquire some operating skills. I have a FT-817 and love it - I use it mobile, portable, while camping, and even at home and have worked an amazing array of countries including New Zealand with its 5 watts and a 12 foot whip fastened to a hotel balcony. Small and capable as it is, it's still heavy if you are watching every ounce as you would on a long trek.
The lightweight champ I recommend is the Elecraft KX-1. It's a kit, so electronics assembly skills are required, but the manuals are very clear (think Heathkit) that anyone who knows how to solder to a circuit board can build it. Smaller than a paperback book, it measures 3x5 inches x 1 inch thick, weighs less than a pound (plus 6xAA batteries), will work on 20, 30 40 or 80 meters and has its own built-in antenna tuner and battery pack, so all you need is a key, your iPod earphones and a roll of wire to throw up into a tree for an antenna, and you are on the air. It is a Morse Code-only rig, though, so you'll have to know the code, but if you are serious about it, it isn't difficult. I take mine on campouts as well, and it's nice to kick back in the sleeping bag and have a few contacts before dozing off.
A couple years ago a ham hiked the Pacific Crest Trail and his communications was a KX-1. He kept a schedule with another ham and would check in regularly. His story was featured in one of the ham magazines. If you want to keep in touch with non-ham family members or associates, you could do the same. You'll meet plenty of hams through your local radio club, and it's likely someone would be willing to set up a sked with you. In that case, he is not only a hiker but was a ham already - he didn't get into ham radio solely as a means of communication while hiking. If you do, you might end up enjoying it - it adds another facet to being outdoors, off the grid but still in touch with just what you carry in your pack.