What can I expect moving to an unaccompanied tour? Is it like a deployment or are there things that are different?

I'm doing a HAAP; the family will be either at Ft Leavenworth or at the follow on. I'll be at Red Cloud; not many of my friends who are here have been unaccompanied at this grade, so I'm not sure what's different and the same.

I'm down in Area IV, so CRC (Camp Red Cloud) isn't in my range of expertise, but I don't think it's much different. There are occasional restrictions on where you can go and when you can go, but everything else is very much like garrison. Weekends are typically off. Holidays are typically off. There is the occasion field duty. We have Hail and Farewells, unit balls and functions, regular morning formations, regular PRT, etc etc etc. No one is wearing IBA on a regular basis. No one is carrying their firearms daily. There are all of the regular amenities - PX, food court, clothing and sales, movie theater, pools, etc.

besides pro grear, what should I bring?

A couch, some bedding, a TV. You'll likely have to get an apartment off-post, so whatever you would bring if you were living alone somewhere. You'll be able to borrow the big appliances (fridge, washer, dryer, etc) from the Housing Office. You can also borrow a desk, and some furniture (but the couches and beds are so uncomfortable, I wouldn't). Bring your computer, Xbox and that sort of thing to keep you entertained. You'll probably be able to buy a junker car for around $1000. Cell phones with plans are relatively cheap here and readily available. Bring a few sets of civvies for the weekends. Anything you end up needing that you don't bring will be available somewhere. Amazon ships here pretty quick. Bring your ASUs, you'll have formal events.

Electronics are more expensive here, so keep that in mind when you think about what you want to bring. I know you are limited on weight. I suspect there will be a fair amount of things available here from people leaving too, so you should be able to furnish a place without too much trouble or expense.