Thank you both for the responses. My flights in and out are domestic so I shouldn't have to worry about immigration wait times. I also, however, realised that I failed my grade 3 maths here in that I reported a layover from 10:00 to 15:00 as 7 hours when in reality it's only 5. What can I say? I'm a moron.
Thanks again for the suggested sights. The museum sounds very interesting. I'll google it for more information.