Each of Boston’s many museums offers free or reduced admission at least one night a week. Plan accordingly and you’ll have cash left for drinks and dinner afterward. Try the MFA on a Wednesday from 4-9:45pm or the ICA on a Thursday between 5-9pm. If you’d prefer a more playful experience and a) aren't bothered by parents giving you the evil eye; or b) worried that you might be sending the wrong signal about moving too fast, the Boston Children’s Museum is only $1 on Fridays from 5-9pm