Am meeting up with my brother and family for a long overdue catch up on Friday - we only have a few hours and it needs to be somewhere just off the m3, vaguely half way between Bournemouth and St Albans. Looked at map and can't see anything obvious near Basingstoke, Fleet type area. DCs are 10, 7, 5 and 17 mo. Somewhere for a picnic, a run round and something interesting to look at/do for a couple of hours. Any ideas?