Here are the corrections for each sentence:

1. **Shall I pour you some tea?** (Correct "teas" to "tea".)

2. **This weather is ideal for a picnic.** (Correct "weathers" to "weather".)

3. **I need to go to the bank and get some money.** (Optionally, change "must" to "need" for clarity.)

4. **How many travel items do you bring?** (Correct "item" to "items".)

5. **Australia has many natural wonders.** (Correct "much" to "many".)

6. **Look! There is a ‘NO PARKING’ sign. You must park here.** (Remove the comma after "Look".)

7. **Tourists often get lost in those dangerous areas.** (Correct "Tourist" to "Tourists".)

8. **We mustn't hurry or we'll be late for class.** (Correct "mustn't" to "mustn't".)

The main errors are in sentences 2, 4, and 5.