The cost of a trip to Goa for 4 days can vary depending on various factors such as accommodation choices, transportation, activities, dining preferences, and your personal spending habits. Here’s a rough estimate of the expenses you might incur:

1. Accommodation: The cost of accommodation in Goa can vary greatly depending on the type of accommodation you choose. Budget guesthouses or hostels can range from $15 to $40 per night, mid-range hotels can range from $40 to $100 per night, and luxury resorts can go beyond $100 per night. For a 4-day trip, the total cost of accommodation can range from $60 to $400 or more, depending on your preference.
2. Transportation: The cost of transportation will depend on your mode of travel to and within Goa. If you are flying, the airfare will vary depending on your departure location and the time of booking. Local transportation within Goa can be managed through taxis, auto-rickshaws, or rented scooters/bikes. Plan to allocate a budget of around $50 to $150 for transportation, depending on your choices.
3. Food and Drinks: Goa offers a variety of dining options to suit different budgets. Street food and local eateries can be quite affordable, while upscale restaurants can be more expensive. On average, budgeting around $15 to $30 per person per day for meals should be reasonable, but this can vary depending on your dining preferences.
4. Activities and Sightseeing: Goa offers a range of activities such as water sports, boat trips, visiting historical sites, and exploring beaches. The cost of these activities can vary, but budgeting around $20 to $50 per person per day should cover most activities and sightseeing expenses.
5. Miscellaneous: This category includes expenses like entrance fees to attractions, shopping, and any additional personal expenses. Depending on your spending habits, it’s advisable to allocate some extra budget for miscellaneous expenses. A rough estimate would be around $50 to $100 for a 4-day trip.

Adding up all these estimated costs, a rough total for a 4-day trip to Goa could range from $300 to $800 or more per person, excluding airfare. However, please note that these figures are approximate and can vary depending on your personal choices and preferences. It’s always a good idea to research and plan your trip in advance to get a more accurate estimate based on your specific needs.