Canobie has been around as long as I have probably...

Canobie has been around as long as I have probably longer. The water park is a good addition to the place, no doubt, but most of the park seems old and/or barely updated. The lines for the same rides that were unbearably long as a kid are still as long as an adult.
Do yourself a favor and no matter how cool the morning temps are, do the water park first. Then change and do rides. People head right in and "save" pool side lounge chairs as soon as it opens and then go out to the park to do the rides. At around 1pm the water park side is innundated with people who were out in the main park all day and it becomes really crowded.
The water park in the morning is pretty quiet, if you hate the crowds I recommend going the opposite way. Water park first and rides in the later afternoon. Good luck if you need a ladies room, the lines in the water park were out the door and down the row of lockers bc it's also a changing area to put on your bathing suit