* Communication is key. If you can't talk to your fiance about everything before the wedding, then don't get married.
* On that note, people can't mind read. If you are unhappy about something, bring it up. Don't accuse if you can help it, use "I statements" (I feel hurt when...,instead of, You're being such a jerk when...).
* Encourage nights out with and without each other. Still do date nights, even if they are in the house in your pajamas.
* You are now each other's most important family members. If you can't hold that relationship sacred, and are more worried about things effecting your parents/siblings than your husband, you ought not be married.