Me, I come home and get super quiet, if the weather is nice enough, I'll take Abby to the dog park, then come home and take a long bath. Works every time.
Usually I need quiet, downtime to shake the bad days off. I need to be alone and just vedge. Either get on the computer or read or do nothing if thats what it takes. It's part of the reason I stay up after DH and DD every night. I need that time to decompress.
I have to get my mind onto something else, or I will sit and dwell on whatever made me mad, upset, sad... it's terrible... so, I watch something or music or read, even if it's not something I like, just to make my mind concentrate on that instead.