I haven't taken the hop on hop off locally, but did take it in another city. My advice is to find out exactly what you are getting beforehand. I didn't know mine was a 3 day pass and we only scheduled one day for it (our last day). We would have used the other 2 days if I knew we got 3 days for the one day price. I'd also book out the whole time it is valid if it is for one day because then you'll feel comfortable spending as much time as you want in any locations where you disembark.
I haven't been to the Anaheim packing district, but it has been recommended to me several times. I just usually get caught up in the Disney stuff and don't venture out. I do hope to visit the Blind Rabbit sometime. They have dress code rules and how long you can sit there rules. http://theblindrabbit.com/
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