Here are the corrections for each sentence:

1. **Correction**: "We had an excursion to Lake Hudson, a man-made reservoir in Oklahoma, last Sunday."
- Mistake: "the Lake Hudson" should be "Lake Hudson" and "in Oklahoma" should be moved in the correct position.

2. **Correction**: "Don't put too much garlic in the salad; two bunches are enough."
- Mistake: No correction needed; sentence is fine.

3. **Correction**: "If you do more exercise, your muscles will be stronger."
- Mistake: "did" should be changed to "do".

4. **Correction**: "Remember not to skip breakfast because it’s the most important meal."
- Mistake: "the breakfast" should be "breakfast."

5. **Correction**: "I don’t like to eat out because it isn’t easy to find a restaurant that has good food and service."
- Mistake: "which have" should be corrected to "that has."

These corrections address grammatical and contextual errors in the sentences.