It's awesome to get your flights and hotels for almost free, but meals and activities can add up! Here are a few things I do to supplement my trip expenses:
Bank Bonuses:
I love Bank Bonuses! They are usually fairly straightforward, and require a direct deposit or transfer of funds to the account. In exchange, the bank will give you a nice bonus.
Look up Doctor of Credit for the most current offers.
Receipt Scanning:
There are multiple receipt scanning sites out there like Fetch, where you get points that you can cash out for gift cards just for scanning your shopping receipts!
Other:
Rebatekey: I use this to buy items at a 100% discount (just paying the taxes unless you live in a tax free state). It helps me to meet the minimum spend on my CC's and I am reimbursed for the items purchased after about 35-45 days.