Ferry services from Athens (Piraeus port) to Chania (Hania) Crete island
Visit www.Ferries.gr  and search through all ferry schedules to/from Chania and the rest of the Crete island.
You have two options for ferry travel to Hania - overnight cruise (approx. 9 hours) from Piraeus on ANEK Lines; or 4.5 hour daytime high-speed ferry from Piraeus on Hellenic Seaways.
Chania airport is much smaller and far less busy than Heraklion airport. However, short (40-50 minute) flights are available from Athens.
You can expect plenty of choices concerning beach and city hotels in the region of Chania.
Crete is a very safe and tourist friendly town. I suggest walking anywhere you can. The cheapest option would be to take the bus (which is also very safe). Besides that, renting a car or taxiing is available.
Explore... The harbor area is beautiful and the lighthouse is incredible.The Maritime museum is also a great visit. Old Town is full of all types of shops, pubs, and restaurants that are aimed toward tourists. Crete is full of a number of beautiful beaches and breath taking views. I suggest checking out Balos (30-40 minute drive). Additionally, I suggest talking to the locals. They will tell you where to go, eat, and visit! For wine enthusiasts, Nostos Winery is a 20 minute drive from downtown and is a beautiful winery that does incredible tastings. There are also all types of festivals and celebrations! Search the internet for festivals in the time period you are staying!
Go where the locals go...
However, if you are looking for a cheap and quick meal you can find Gyro's all over town.
A must in Crete is Raki! Be careful... it packs a punch. Additionally, many local bars and restaurants give out free shots or drinks to all costumers.
You can walk to the bus terminal easily from the harbor or main market square - 5 to 10 minutes.