I’ve been in Playa several times for Halloween and it is crazy. The streets are packed, the clubs on 12th are busy early. I always bring change with me when I go out for dinner because the kids are running from restaurant to restaurant trick or treating. You’ll be glad you went over Halloween.
The weather can be rainy this time of year. I’ve gone to Playa the last six years in early November and the weather has been decent. There have been several trips where it has rained every day but it usually blows over in 45 minutes.