Some hiking side notes:
We researched the trails ahead of time, packed a lot of water in each of our backpacks, I had rope, compass, whistle, extra food, blanket, first aid kit, ace bandages, and bug spray in mine to name a few things. We also talked about hiker safety and ethic. We stayed on the trails, payed attention to what trail we were following (encouraging our children to find the next trail marker), we stayed together, and followed "Leave No Trace" by cub scouts.
Mt. Monadnock- is aprox 3200 in elevation. We followed the white dot trail up (little over 2 miles to summit) and the white cross trail down. Both trails have some pretty tough terrain where we had to use 3 points of contact to maneuver. It took us about 2 hours up and 1.5 coming down.