Snowdonia is great, been back there several times since my dad first took me there when i was about 9. for mountains its much better than the lake district imo. Its got my favorite mountain there, mount Tryfan, which i've climbed more times than i can remember,
taken about halfway up
plus snowdon itself, which if you go up Crib Goch is particuarly cool, although climbing along the knife edge ridge in a total white out on all fours was not one of my better ideas
if you've never been before, thats where we'll have to go.
As to Lulworth and tanks, the closest i ever got to tanks was listening to them on manurers in the next valley somewhere in cumbria, and boy are they loud. Did get to play around alot in warriors though, over in Germany, when i was attached to the Green Howards at Sennelager, and they are great fun to drive, less fun in the back though....