@fat13 Ignore all the doom-mongers and haters on here. Blackpool is no worse than any other city or town...
Definitely go. (To Blackpool!)
Bits of it, are a bit grotty, and I wouldn't veer off the main seafront and attractions after 9pm, (as you tend to get a few drunken louts in the backstreets after that time...) But there's loads to do. You can get a 'pass' that lets you into multiple attractions... Ask at the reception desk of one of them, (say, the Tower,) and they will tell you about it/sell you one.
Here's a bit of info on it.
www.visitblackpool.com/resort-pass/faqs/#:~:text=The%20Blackpool%20Resort%20Pass%20is%20our%20original%20pass,SEA%20LIFE%20Centre%20and%20The%20Blackpool%20Tower%20Dungeon.
Even if the weather is a bit 'meh' you can still enjoy yourself, because lots of the entertainment is inside. There are loads of arcades and bars and eateries, and it will be a great place to go for a few days.
Me and DH went last week, and had a great time. The illuminations are fab!!! There is a catalogue surplus place there too around 200 yards from the seafront (in the shopping area obvs,) that has stuff from NEXT, STUDIO, M & S, and a few other big stores, for a third of the original price. I got some real bargains there last week!
Hope you have a lovely time! 
(Wales - and its seaside resorts - is beautiful, but I wouldn't go at the end of October, as there will be very few places open, and it's very weather-dependent. So I wouldn't go there right now...)