I went for a long weekend to Mexico with 8 of my high school friends to celebrate the year of our 40th bdays. We had a blast- sun, drinks, spa, no kids.....
some of my friends also had parties for their individual bdays- one dicso 70's themed, one 80's prom themed, one bollywood themed.
For our actual birthdays (10 days apart), my husband and I have planned a long weekend to New Orleans, but have to put it off for business reasons (good business reasons, though)