Oh dear, you should make time to go! I imagine that you won't find it as boring as you imagine!I enjoy going to science & interactive museums...Never been to an art museum, but I can't imagine that it's all that interesting.
My first visit to an art museum was when I was around three. My mom would take me to Modern and Metropolitan (in NYC) as part of our homeschooling (we also did random photography exhibits, etc). We would go at least once a month. Honestly, I didn't appreciate it til I was around 12, but now the Metropolitan is a top pick for me on the weekend. I've been over twenty times and I never get bored of it!
So, I would definitely take a museum over a theme park anyday!