Budapest advice please please please!

[Ab31]

Hello!
I am about to spend 3 weeks visiting my hubby who is working in Budapest. He will be working most of the time so I will be with the children (2 and 6) on my own most of the time. Does anyone have any advice/tips/must sees etc? Would really appreciate it!
Thanks!

Ooh haven't been for years but we had a fantastic week there once. The Fisherman's Bastion and the Cathedral on the Buda side. Also the caves underneath. Some good hints here We went to the wild animal park mentioned here and the Statue Park here

I want to go back now. They were filming Evita when we were there and I spent most of the week hoping to bump into Antonio Banderas.