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Very tricky one that it really depends what you are planning on photographing and how much equipment you want to carry around.

For example if you want to do some proper landscape the firstly you may want to invest in a more sturdy tripod and a wide angle lens such as the SIgma 10-20mm.

If you want to limit equipment then you may want to consider a travel lens such as the Tamron 18-270mm or Sigma 18-250mm although these are both a compromise because of the wide to zoom coverage.

You may want to upgrade your kit lens to something a bit sharper and with a bigger zoom range.

Are you planning on doing night photography where a more powerful flash will be helpful?

Other considerations are do you have a spare battery, enough memory cards and is your camera bag up to the job for example.

Another considration is your camera strap comfortable for long periods of time.

These are just some ideas but have a think about how much you are going to spend, what you are really going to need or can you get by with what you have got for now and take the holiday as an opportunity to find out what would be helpful in future.