As someone else mentioned Tropical world in the canal gardens opposite the main Roundhay Park entrance is great also, kirkstall abbey for kids to climb and run around, across kirkstall road is the Abbey house museum, with an old Victorian street, plus all the old shops and kids can dress up, the rest of the museum is a children’s museum film of toys to play with, also cafe downstairs. There are loads of other places as well, Harewood house is a great day out, Meanwood valley farm, and meanwood trail, we are also a very short drive from the countryside too.