I worked with someone on their book, 7 weeks to 700, which tells people how to get a credit score of 700 or better in just over 2 months. According to the credit scoring algorithm, the ideal number of credit cards is 3. (1 Visa, 1 MasterCard, 1 either AmEx or Discover, for best coverage). Ideal credit utilization is 30% or less. Both of those will raise your credit score by quite a bit. But I wouldn't look at this card if you're not already taking the trips, because rather than saving money, it would just encourage you to spend more than you do now. :-)