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Big Space (indoor soft play in harpenden on the southdown industrial estate)
Come to St.A for: Verulamium park where there is free toddler splash park, playgrounds, huge space for picnics kick a ball, feed ducks Willow Farm (under 2's are free) Clarence Park (sandpit) Rhyme Time (St.A library tues morning, free) DJ Jungles St.A (a bit grubby though and hot in hot weather) Pots of Art on holywell hill for messy painting Swimming in harpenden or st.a Butterfly World
Or you can go to whipsnade zoo near dunstable downs, or ashridge estate near berko for a run around in the forest here's some more ideas:http://www.dayoutwiththekids.co.uk/things-to-do/st_albans