Why you should go: On these 5-star sailings, you'll visit lesser-known ports of call that avoid the summer crowds found elsewhere. Plus, you'll enjoy high-end service and gourmet cuisine aboard a yacht-like ship.

What's the big deal? This Swan Hellenic offer includes a $500 per person onboard credit, which can be used for spa treatments and excursions, among other things. We've researched these cruises and found that you'll save up to $3500 vs. pricing found on other travel sites.

Choose from sailings that range from 8-11 nights and depart on select dates in August-September. Prices start at $4935 per person and include the following:

• Accommodations aboard the SH Diana, plus one pre-cruise hotel night where applicable
• All meals aboard, plus coffee, tea, soft drinks and selected alcoholic beverages available 24 hours per day (room service, too)
• Lecture programs by an experienced expedition team and guest speakers, plus one selected shore excursion/expedition activity per port of call
• $500 per person shipboard credit, onboard gratuities, port taxes & standard Wi-Fi

Swan Hellenic is also offering 50% off cabin upgrades, which means the more you upgrade, the more you save. Click "View Deals" below for more information.

To book, call 1-800-537-6777 from Monday-Friday: 9 a.m.-6 p.m. ET and mention "Travelzoo50+." Or, fill out the "request a quote" form on Swan Hellenic's site and select your departure date. Then, click "submit."