The Capital One card I have is 2% back on everything in the form of travel rewards. Any purchase that is categorized as travel (taxis/ride share, flights, hotels, touristy purchases) can be instantly redeemed at the 2% rate even if you don't have enough points to erase the entire purchase. Purchases can be erased up 90 days after they happen.

If you want straight cash it's 1.5%.