I don't suggest a thigh holster for hiking, they tend to dig into your leg after a long day wearing them. Especially if you're like me and you enjoy walking a decently long distance.
If for whatever reason you don't want to carry on your belt while camping and hiking, I would instead suggest a shoulder holster, or in the case of hiking perhaps a holster attached to a backpack strap.
Oddly enough, for special occasions like that, the best holster I've found is a Crossman, available at your local OC friendly Walmart. It's disigned around their co2 pistols, which range from compact auto sized to hand canons, and bloody heavy. It's the only holster I've found in-store anywhere that will fit my Tanfoglio 10mm.
The retention strap is a combo button & quick-buckle. The quick buckle holds tight when in use, but when released, it goes loose. A couple quick stitches fixed that in about 2 minutes. The "belt loop" is a 4 inch x 2 inch velcro strap with smaller straps at the bottom to prevent release. This makes it easy to firmly secure it to my 2" belt, or to the 1" webbing on my camera bag. And, of course, it has an extra magazine pouch, which snugly fits my 10 round, 10mm mag. When it's in place, it takes 2 firmly planted feet, a good grip, and a long pull to force it off (I tried, worried about being easily disarmed). But, with the quick-buckle, I can draw and aim in about 1 second without trying too hard.
While I wouldn't advise it as your regular carry holster (i mean, it is from walmart. I presume the stitching will start coming loose in a few months), it works great on my camera bag (hiking pack style) on the shoulder straps, the hip strap, and mount points on the shoulder straps.