Do they have complementary rooms

Yes based on use of your players card.

They have alot if rooms it's a casino and hotel

Other people I know will get free rooms like my co workers an family but I never have . But that don't me you won't get offers for that

Yes if you are a regular player and if not the next morning before checkout you can ask a host to evaluate your play to see if discounted or comped

Yes they do but there's a $100 deposit that you get back when you check out

I get flyers from downstream casino at least once a month and from Sunday to Thursday the rooms are free if you're a member other than that I think they're like $39 on a special but as far as a daily price I don't know I've never stayed there

They do have complimentary rooms based on play. If you get so many points, they might send you a discounted and sometimes free room voucher in the mail. Very, very rarely I have seen cases where someone has put large amounts of money out at one night (tracked by your players card) and the host gave them a room for the night.