I like spending time with my mum. We've been on trips together, spa days, shopping trips etc... I think that's normal mother-daughter things to do when you're close and enjoy each other's company.
I don't class my mum as a friend though, she's my mum and the dynamic is different, but still one I really love and value.
I think spending time with your daughters and enjoying each other’s company is lovely and don't let your ex make you think otherwise!!
My only cautionary advice is, given you've just come out of a difficult relationship, try not to put the burden of your feelings onto your daughters. I think when the dynamic swaps from your kids leaning on you, to you leaning on them, it can negatively impact your relationship.
I speak from experience with this. I'm happy to spend time with my mum and support her and I'm of course concerned about her well-being and happiness, but when she’s sometimes unloaded way too much emotional stuff on me and I've felt really uncomfortable and overwhelmed. It's felt so different to a friend unloading, more inference (because she's my mum). It also made me feel unsettled, she'd always been my safe space and person i could come to, and i felt like that was lost and that then made me feel vulnerable. Again, this is unique to her being my mum, i dont feel that was with friends.
So enjoy your daughters and go on that weekend away! Just don't rely too heavily on them for emotional support. Look for that from your other friends.