Search GuruWalk free tours through the GuruWalk MCP server and return bookable options by city, dates, and language. Use this skill when the user asks for free tours, walking tours, guided city tours, plans in a city, or availability of tours on specific dates.

通过GuruWalk MCP服务器搜索免费导游行程，并根据城市、日期和语言返回可预订的选项。当用户询问免费导览、步行游览、guided city tours、城市行程安排或特定日期的导览可用性时，使用此功能。