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Generative AI > Google Gemini API > Travel Itinerary Planning Agent

Travel Itinerary Planning Agent

Author: Venkata Sudhakar

Planning a detailed travel itinerary requires juggling destinations, hotel availability, local transport, attraction timings, and budget - all simultaneously. A travel planning agent can absorb all these constraints and produce a complete, day-by-day plan in seconds, personalised to the traveller's preferences and budget.

In this tutorial, we build a travel agent for Indian domestic tourism. The agent creates a detailed 3-day itinerary for a family trip to Rajasthan, with budget breakdown, hotel suggestions, and practical travel tips.

The below example shows the agent generating a complete itinerary from a natural language request.

import os
from google.adk.agents import LlmAgent
from google.adk.tools import FunctionTool
from google.adk.sessions import InMemorySessionService
from google.adk.runners import Runner
from google.genai import types

def get_destination_info(city: str) -> dict:
    """Get key attractions, hotel tiers, and local tips for an Indian city."""
    destinations = {
        "jaipur": {
            "attractions": ["Amber Fort", "Hawa Mahal", "City Palace", "Jantar Mantar", "Nahargarh Fort"],
            "best_time": "October to March",
            "hotels": {
                "budget": "Hotel Pearl Palace (Rs 2,500/night)",
                "mid": "Samode Haveli (Rs 8,000/night)",
                "luxury": "Taj Rambagh Palace (Rs 35,000/night)"
            },
            "local_tips": ["Auto cost Rs 200-300 for short trips", "Must try Dal Baati Churma", "Bargain at Johari Bazaar"]
        },
        "jodhpur": {
            "attractions": ["Mehrangarh Fort", "Umaid Bhawan", "Jaswant Thada", "Mandore Gardens", "Clock Tower Market"],
            "best_time": "October to March",
            "hotels": {
                "budget": "Cosy Guest House (Rs 1,800/night)",
                "mid": "Raas Jodhpur (Rs 12,000/night)",
                "luxury": "Umaid Bhawan Palace (Rs 45,000/night)"
            },
            "local_tips": ["Blue City - explore old town lanes", "Try Mirchi Bada and Mawa Kachori", "Mehrangarh sunset view is unmissable"]
        }
    }
    return destinations.get(city.lower(), {"error": f"No data for {city}"})

def estimate_budget(cities: list, nights: int, hotel_tier: str, travellers: int) -> dict:
    """Estimate total trip budget for a Rajasthan itinerary."""
    hotel_costs = {"budget": 2500, "mid": 9000, "luxury": 38000}
    per_night = hotel_costs.get(hotel_tier, 5000)
    hotel_total = per_night * nights
    food_per_day = 800 * travellers  # Rs 800/person/day
    transport = 3500 * len(cities)   # inter-city cab
    entry_fees = 500 * travellers * 3  # avg 3 monuments
    total = hotel_total + food_per_day * (nights + 1) + transport + entry_fees
    return {
        "hotel_total": hotel_total,
        "food_total": food_per_day * (nights + 1),
        "transport_total": transport,
        "entry_fees": entry_fees,
        "grand_total_rs": total,
        "per_person_rs": total // travellers
    }

travel_agent = LlmAgent(
    name="travel_planner",
    model="gemini-2.0-flash",
    instruction="""You are an expert Indian domestic travel planner.
Use get_destination_info for each city and estimate_budget for the trip cost.
Create a detailed day-by-day itinerary with morning, afternoon, and evening plans.
Include hotel name, food stops, practical timings, and local tips.""",
    tools=[FunctionTool(get_destination_info), FunctionTool(estimate_budget)]
)

Now run the agent with a travel request,

It gives the following output,

3-Day Rajasthan Itinerary - 2 Adults, Mid-Range Budget

DAY 1 - JAIPUR
Stay: Samode Haveli (Rs 8,000/night)
Morning: Amber Fort (9 AM - 12 PM) - Rs 500/person entry. Book guide.
Afternoon: City Palace and Jantar Mantar (2 PM - 5 PM)
Evening: Hawa Mahal for photos, dinner at 1135 AD (Rs 1,200 for two)
Tip: Hire auto at hotel for Rs 800 full-day sightseeing deal

DAY 2 - JAIPUR
Morning: Nahargarh Fort (9 AM, sunrise views)
Afternoon: Johari Bazaar for shopping - bargain for block prints
Evening: Chokhi Dhani for Dal Baati Churma dinner experience (Rs 900/person)

DAY 3 - JODHPUR (cab 5 hours, Rs 3,500)
Stay: Raas Jodhpur (Rs 12,000/night)
Afternoon: Mehrangarh Fort (2 PM - 5 PM) - catch sunset from battlements
Evening: Clock Tower market, try Mirchi Bada, Lassi at Shri Mishrilal Hotel

BUDGET ESTIMATE
Hotels: Rs 28,000 | Food: Rs 6,400 | Transport: Rs 7,000
Entry fees: Rs 3,000 | GRAND TOTAL: Rs 44,400 (Rs 22,200 per person)

Add a flight search tool and hotel booking API integration to convert this planning agent into a full booking assistant. Connect to real-time weather data to dynamically adjust outdoor activity recommendations. For multi-city trips, add an optimal route calculation tool to minimise backtracking.

Send your comments, suggestions or queries regarding this site to [email protected].