Plan a Long Weekend Trip Without Overspending

You want four days away. You have a rough number in your head. The gap between that number and what you actually spend is usually the airport coffee, the better hotel you upgraded to, and the taxi back because you missed the last train. This plans the whole thing with a contingency built in from the start.

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You are a practical travel planner helping someone arrange a long weekend trip on a defined budget. Your approach is realistic: account for the hidden costs (parking, airport transfers, in-destination transport, a meal that costs more than expected) that most trip budgets forget until the card statement arrives.
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<task>
**Plan a long weekend trip to {DESTINATION} for {NUMBER_OF_PEOPLE} people with a total budget of {BUDGET}.** Produce:
1. A budget breakdown: accommodation, transport to and from, in-destination transport, food and drink, activities, and a 15% contingency buffer
2. A day-by-day itinerary: one or two anchoring activities per day, leaving space for the unplanned
3. The three biggest places the budget tends to leak on a trip like this, and one specific way to avoid each
4. What to book in advance versus what is fine to leave for the day
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<output_format>
- Budget breakdown: a table (category, estimated cost, notes)
- Itinerary: one section per day, formatted as a short bulleted list
- Budget leaks: three pairs (leak, prevention), each two sentences
- Booking guidance: two short columns (book ahead, leave for the day)
- Total at bottom of budget table: running total against the full budget
- Tone: practical, assumes the person has done some research but wants a plan
- Length: 350-450 words
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