My contact us page has a 90% hard bounce rate.
What do users expect to find on the contact us page?
I would like to reduce the bounce rate and engage the visitors more.
I think the first question you need to ask is whether they were already on their way out when they came to this page.
For example, if they're coming here to get your phone number so they can make a call or email/postal address so they can write to you, it's quite likely that once they've got that bit of info, then the next thing they'll do is leave the site so they can contact you.
They've already made the decision as to what to do next. Going to your contact page is merely providing the information required to carry out that decision; leaving the site after browsing to the contact page is just a natural progression from there.
The bounce rate from the contact page is irrelevant; what you need to do is track back a step to see what pages they were on prior to the contact page, and find out what it was about those pages that makes people want to contact you (rather than continue with their order).
It's hard to know what users expect, but the best way is to talk with them. If you can identify them (for example, if you have a registration/signup process), you can set up quick interviews with a representative sample.
People like to help out, but if you have something to offer, that will make them more likely to talk with you.
Some other things to think about: