My 11 yr old son wants to catch some pickerel,  We typically get to fish in Nashua Nh and Concord/ Loudon Nh area.

We have a small 10ft jon boat with a small electric motor

Horseshoe Pond in Concord, Turee Pond in Bow, Turtle Pond in Concord, all have some pickerel in them.  It's a short walk from the parking lot to the pond at Horseshoe, and there's no ramp, but you could get a boat in there.  Turee and Turtle Ponds both have concrete ramps.  There's also a beaver pond on S Curtisville Rd that has a lot of BIG pickerel in it as well, but I don't think you can put a boat in it.

i really cant think of any ponds that i know of that dont have pickeral. i probably catch more pickeral than anything else at flints pond in hollis. its getting pretty thick with milfoil right now so you will need to fish weedless. we do good with t-rigged senkos there.

heres a pic of a 2.5# pick my wife caught there.