问题: What difficulties do people often face when travelling?

A big problem with traveling is the surprise expenses. You can easily spend more than planned, because of extra costs like baggage fees or changing money. Even if you have a budget, it's hard to stick to it with tourist attractions and activities that you didn't plan for.

One major challenge when travelling is definitely the unexpected costs. It's easy to go over budget, especially with hidden fees like extra baggage charges or currency exchange rates. Even with a well-planned budget, spending can spiral out of control with tempting tourist traps and unplanned activities.

动词短语："go over budget" 使用动词短语来描述超出预算的情况，使句子更直接和明确。 过去分词作定语："hidden fees" 使用过去分词作定语来形容费用的类型，增加了句子的描述性和详细性。 不定式短语："spending can spiral out of control" 使用不定式短语来描述开销可能失控的情况，强调了潜在的风险和后果。

A common problem is the crowds at tourist spots and long lines. Famous places are often too crowded, especially in high season, which can make the visit less fun. It's frustrating and tiring to wait in line for a long time to see a well-known place or attraction.

In my view, a common difficulty is dealing with overcrowded attractions and long queues. Popular sites can be packed, especially during peak seasons, leading to a less enjoyable experience. Waiting in line for hours just to see a famous landmark or attraction can be quite frustrating and exhausting.

动名词短语："dealing with overcrowded attractions" 使用动名词短语作主语，描述旅行中的一个常见难题，增加了句子的动态性。 被动语态："can be packed" 使用被动语态来描述景点的拥挤状态，强调了景点的状况而非旅行者的行为。 现在分词作定语："waiting in line for hours" 使用现在分词作定语来描述长时间等待的情况，增加了句子的描述性和细节。