Among the highlights of Insignia's action-packed itinerary are the Old Town area of Stockholm; modern architecture in Helsinki; onion domes and ornate palaces in St. Petersburg; the well-preserved medieval city of Tallinn, Estonia; the botanical gardens of Visby, Sweden; towering castles in Riga, Latvia; beautiful churches in Gdansk, Poland; and the canals of Copenhagen.

This cushy, mid-sized ship will charm you with its gorgeous atrium, upscale decor, and well-appointed cabins with plush mattresses and silky linens. Relaxed luxury is the feel here, and that extends to the "country club casual" dress code (leave your tux at home). There's no fee for dining at the wonderful alternative restaurants, Toscana and the Polo Grill. Find out more.

Oceania's onboard enrichment program includes dance lessons, arts and crafts classes, culinary demonstrations, and celebrity guest speakers. Food is a highlight of this cruise—you may even find yourself dashing back to the ship on a port day, in great anticipation of dinner. Find out more about Oceania Cruises.