What will be the extra cost of stopping over in Singapore, as I have a cousin there?

My cousin and I are planning a trip to Australia. We’re planning on being on the east coast. What places should we see? (beaches, monument, museums, etc.). We’re also looking for small places inns to stay locally and a quality tattoo parlor. Help please?!?

My cousin and I are in our early 20′s. We are planning a 10 day back packing trip in europe. we plan on staying in Hostels and living out of bag! Any suggestions on where to visit.. must see’s… and cheap places to fly into and out of would be great!