TripShock! (Top Choice)
TripShock.com not only has a wide selection of activities, but it has several great deals and promo codes are always avaialable. Go to TripShock Gulf Coast to view a list of their activities in Destin and the best deals.
The Destin Boardwalk website has several great deals and offers all the time. They even sell up to 50% off gift certificates to some local activities and attractions. They usually only have a limited supply so you need to buy them while they are available. Visit Destin Boardwalk to view a list of their coupons and discounted gift certificates.
Groupon usually has 50% off deals for activities and attractions for Destin. Subscribe to their email list and just wait for a good deal.
SEE magazine is a visitor publication that you can find in most hotels and restaurants in Destin. There are usually discounts to restaurnats and activities in these booklets. They are not usually big deals, but they will help save a few dollars on your activities.