Canobie Lake Park is probably best left as a place for summer corporate outings and not much else. There is not a huge variety in terms of rides and everything has a long line. The most exciting attraction there is the bridge where you can watch the log flume ride splash down and soak everyone in the immediate region. For an admission price of $26 adult there is not a lot to do and you'll spend most of the day waiting in line. If for some reason you get to go for free (job outing, etc), go for it. You're not out any money if you do it that way. The price is in line with other theme parks like it, but there are not as many attractions there.
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