Ta Ku is about one hour trip + one hour of mountain climbing if you don't chose to use the cable car. As often I do, I rather climb up and take the cable back down as so we did here.
There are some temples and holly sites to visit here as well and the very famous lying Buddha.
Hoa Vien Brewery
This Hoa Vien Brewery is easy to spot, you will see this "German" style mug by the road between Phan Thiet to Mui Ne. Just stop over, step into the open air restaurant and order the white or dark excellent beer they are brewing here with Czech technology. And to be honest, I lived in the Czech and that beer is as good as you can dream of.
*More about the beer I have created tip in local customs.