Bachelorette party!

If the two of you are comfortable doing what your FH suggested, go for it! You could just set it as one activity together and then go about your separate parties. If you're not too sold on the idea, just tell him you'd rather enjoy the parties completely separate

Just have whoever is planning the parties make sure that you don't coincidentally end up at the same place at the same time.

I think that's fine. I'd just connect the MOH & BM so they can compare schedules on who is doing what when.

We did a group trip to Vegas. I didn't sit by my then fiance on the plane. We traveled all on the same plane, stayed at the same hotel in different suite buildings, and we had one big group dinner. Otherwise, we did separate activities. We met up again on the strip the last night to walk back to the hotel.