5x anywhere
I applied, and was approved, for a Chase Ink Bold card this past June. This was a business card, and when I applied I was given a pending status. I immediately called Chase, they asked me a few different questions (i.e. what was the business, how much money did I make last year, how much do I plan to make this year, etc…) and 5 minutes later I was approved. The sign-up bonus was great: 60K Ultimate Rewards – which can be instantly transferred to Southwest (worth more than $700 in tickets, or $1,400 in tickets if you have a Companion Pass), Hyatt, United or many other airlines/hotels. To put it in perspective, this credit card sign-up alone will most likely get me from Bali to Cleveland, in Business Class, on an upcoming trip.
In addition to the sign-up bonus, one other feature of this card is amazing for racking up points quickly: All spend at office supply stores earn 5X Ultimate Rewards Points. You might be asking why earning 5X points at an office supply store is such a good benefit:

The Amazing Gift Card Rack
All merchant gift cards can be purchased without any additional fees. Macy’s? Check. Southwest Airlines? Check. This can either be viewed as a 5% discount (since Ultimate Rewards can be cashed out at $0.01/point) or worth roughly double that for airline miles. I wouldn’t recommend the Marriott Hotel gift cards, because they can often be found for a 10%-20% discount at other places online.
It might not seem like a big number, but if you are buying a $300 flight Southwest flight, purchasing the gift cards at Staples/OfficeMax/Office Depot will yield you 1,500 points, more than 10% of the way to a one-way flight on United.
Adding this asset to your toolbox just allows one more way to maximize points. Don’t forget about the various Dining Networks that give you up to 5 bonus points per dollar spent at restaurants you might already be going to. It takes 5 minutes to link your credit card once, and then you never have to think about it again.
Through maximizing miles/points, I currently have over 200K Ultimate Rewards points, and before booking my trip to Alaska (for $30), I had over 750K miles across many programs.