Hello! That's a great decision. Sri Lanka is a glorious blend of historic culture and spectacular nature. Here are few tips for your travel.

Best Time to Visit:
The best time to visit is during their dry season which is generally from December to March for the West and South coasts and from April to September for the Ancient Cities and the East coast.

Route and Accessibility:
Bandaranaike International Airport in Colombo is the most accessible airport. You can take trains, taxis, or buses to get around from Colombo to Anuradhapura and Polonnaruwa.

Accommodation and Booking:
There are many options for accommodation from budget guesthouses to luxury hotels. Online booking platforms are usually reliable for booking accommodations. Look for options that suit your needs and budget.

Clothing and Essentials:
The weather can be quite hot and humid. Pack lightweight, breathable clothing, sun hats, sunglasses, and good sunscreen. Don’t forget your swimsuits and beach accessories if you're planning to visit the beach. Some temples require modest clothing so make sure you carry a shawl or a sarong.

Health and Safety:
Make sure you're up-to-date on routine vaccines. Stay hydrated and use mosquito repellent. Exercise normal precautions while travelling.

Local Etiquette and Respect:
Sri Lankans are known for their friendliness. Respect local traditions and customs, always ask for permission before taking photographs of people, and dress modestly when visiting religious sites.