I've become a huge fan of websites like Groupon and Local Twist. They're especially great for people who live in a large metropolitan area or those who are traveling to a large city and want to find good deals while they're there.
(Please note - these links are my personal referral links. I get $10 credit every time someone signs up from these links. But if you sign up, then you can refer your friends and get $10 credit from each referral too. Everybody's happy!)
These sites are FREE to join. Let me reiterate - THEY ARE FREE. And when you join, you are offered at least one deal a day (for Groupon, since I live between Seattle and Tacoma, I can take advantage of the daily deal for both cities). You can have deals sent to you via email, or you can follow them on Facebook or Twitter and get your deals that way.
So...if you're not already a member, you're probably wondering how this works.
A deal is offered - say, $10 for $20 worth of food at a local restaurant. (They do plenty of entertainment, travel, adventure/sports and spa deals too.) If enough people take the deal, then the deal is on. You sign up to take the deal. You pay your $10. If the deal is on, you get a coupon to print out for $20 worth of food. If not enough people sign up for the deal (I have never seen this happen), you don't get charged and you don't get the deal. Simple as that. Typically, you have about a year or so to use your coupon, although this can vary depending upon the deal being offered.
So...if you're planning to travel around any major American or Canadian cities in the near future, I would highly recommend that you check out these sites and sign up. You can save yourself a lot of money. My friends and I love these sites and have taken advantage of a lot of the local deals already.
Also note: Groupon is available for several different countries. Definitely worth checking out if you do a lot of traveling!