That's not a really clear question. But, it would be easier to get into Thailand and enjoy your time in the country if you were fully vaccinated.
As far as being sensible, having the normal vaccination regime is always a good idea for humanity and society, if not yourself. This includes Polio, Tetanus, diphtheria, MMR, and pertussis. Optionally, but still important, would be the HPV and seasonal flu boosters.
What you do is up to you, but it's your life to enrich or shorten as you want.