Farming World Faversham, Howletts Zoo Beakesbourne is great but need to time it well for the weather otherwise all animals indoors!. Nice walk along Pegwell by the Viking Ship, or Sandwich Bay (have to pay) or walk from Dumpton gap to Broadstairs then have a knickerbocker glory in Ciapinos or play on Broadstairs beach if weather good(our childhood treat!). Diggerland in Medway, will try and think of some more.
We did Diggerland today Had a fab time. Points to note - under 3's are free & if you buy tickets online they're cheaper, but you can't do that on the day. You can buy vouchers on Ebay at the moment to get a free entry, so worth doing.
My partner wantstogo take the kids to diggerland, they're only 4 months and 2, would it be worth us going?
Also Deals got a nice beach to walk along, and there you have Deal castle which my dd loved exploring and Walmer Castle further up the road (we have English Heritage membership and make good use of the gardens at Walmer Castle they are fab for kids to safely playin and explore and great for picnics, prob bit late in the year now for that though unless you like to do 'extreme picnicking!' (sp?!) )