Natio sun kissed glow self tanning is excellent if you are not confident in self application. Quickly builds a lovely colour with no biscuit smell, I’ve only found it in Tesco or online.
St Tropez is my choice for instantaneous tan, if you are confident in applying it.
Spray tan would be my choice for a one off special occasion, you don’t have to wear a paper thong, you can wear your swimsuit and drop the straps. You can have the flesh on show sprayed, you will need to wear old clothes afterwards while it dries.
Absolutely most important is the exfoliating preparation this must be done correctly otherwise any tan will be patchy.
Enjoy your holiday 