Here are some tips for visiting John's Deli located at 183 Post Ave, Westbury, New York:

1. **Try the Specials**: Check out the daily specials, which often feature unique sandwiches or house-made items that are not on the regular menu.

2. **Get There Early**: The deli can get busy during lunch hours. Arriving early can help you avoid long waits and ensure you get the freshest options.

3. **Sample Before You Order**: If you're unsure about what to try, don’t hesitate to ask for samples. The staff is usually happy to let you taste different meats or spreads.

4. **Take Advantage of Customization**: Personalize your sandwich with various toppings and spreads. Don’t hesitate to ask for recommendations!

5. **Check for Catering Options**: If you’re planning a gathering, inquire about catering services; they may offer platters that are perfect for events.

6. **Follow on Social Media**: Stay updated on new offerings and promotions by following them on social media platforms.

Enjoy your visit!