Agreed on the video needs. Consider Sony E 18-135mm f/3.5-5.6 OSS for travel.325g total weightInternal OSS stabilization27-202mm equivalent range Soli...
I went through this last year too. Honestly, that f/4 lens is killer for daytime but it LITERALLY falls apart in dark venues. I found out pretty quick...
For 4K video and fast burst shooting with your a6700, a V60 UHS-II SD card is ideal. SanDisk Extreme Pro, Sony Tough, and ProGrade Digital are all goo...