Are there any destination vacation booking services that focus on planning cruise itineraries with excursions and shore-day add-ons?

Yes — there are travel services and cruise-focused planners that specialize in destination cruise vacations, including itinerary planning, shore excursions, and add-ons for port days.

A few types to look for:

• Cruise travel agencies / cruise specialists
  These often help with the full trip: selecting the cruise, booking cabins, arranging pre/post-stay hotels, and recommending excursions.

• Destination management / shore excursion planners
  These are more focused on the land side: private tours, port transfers, local guides, and custom shore-day experiences.

• Concierge-style cruise planners
  Some agencies package a cruise with curated excursions, dining, spa, and destination experiences in advance.

• Luxury travel advisors
  Especially useful for premium cruises or complex multi-stop itineraries; they can arrange private excursions and bespoke add-ons.

What to search for:

• “cruise itinerary planner”
• “shore excursion booking service”
• “cruise vacation concierge”
• “destination cruise travel advisor”
• “private cruise excursions”

If you want, I can also:

1. suggest specific companies/services by region or cruise line, or
2. help you design a service concept/business model for this niche.