I found weekends really tough initially I don't agree 1 = easier if they have siblings they can play together and amuse each other. I felt often I wasn't enough for dd.
It got easier.
Soft play got a lot of business from us, then we moved somewhere that the local cinema had a cheap family film showing on a sat morning which we loved, we'd go to that then have lunch and a wander around local shopping mall and dd could get some cheap craft/colouring/pound shop toys which when we got home we'd play with.
Then we'd do a fun tea, either frozen pizza and chips or a "picnic" on the carpet
Once she was in bed I'd watch tv or a film I couldn't when dd awake, more grown up fare.
Sometimes I'd have a chat by phone with friends or family depending who was free.
We went through a phase of being involved with local church. I was raised catholic but actually am not particularly religious but it was a lovely friendly church and they had a great Sunday school dd loved and there was a lovely friendly and not overly religious vibe "cafe" time held in the hall after the service and the congregation and minister were very welcoming.
Then we'd take a wee walk to corner shop on way home, I'd get a Sunday paper and dd a comic and we'd get a treat sweetie each then home, dd would "read" her comic (mainly she'd be colouring in pages and playing maze games) while I did laundry and prepped us for the week (packed lunch, ironing uniform etc) we'd have music on and sometimes we'd have a little dance or singalong.
I'd do a simple/cheat version of a Sunday roast (dd tends to preferring traditional plain British food) for dinner including pudding which as dd got older she'd "help" with.
Then it'd be a bath for dd, plait her hair when wet so Monday mornings she'd have neat and tidy hair (believe me once a week was an achievement with dd! 
)
After dd was in bed I'd have a long hot bath myself with music and a book.
Of course different people like doing different things and we didn't do the same every weekend. In summer we'd go to the beach, winter wrap up warm and go to the park, we'd also do things like go swimming, school fairs when they were on, local fairgrounds when they were visiting, as dd got older and more interested/able for such places we'd go to museums, art galleries (many of these do child friendly free or very cheap events in the school holidays anyway, sign up to local council/tourist board/the specific museum websites and you'll get emails and texts telling you about events and even for those that cost there's often vouchers sent via email or you can use things like Clubcard points etc to get money off.
We've been to dress up days where dd has "experienced" being a Victorian school child or a ladies maid and things all good fun, and educational too (and not just for the kids)
But the evenings are hardest. Plan things you'll know you'll enjoy, take up hobbies you can do at home, may sound old & fuddy duddy to some but I've done cross stitch for many years and at this time I went through a phase of doing baby and wedding samplers as friends and family were at that stage so it was something for me to do AND created a gift for them (which I think they liked as they still have them displayed), also knitting, crochet (quite a few friends seem into that now) adult colouring, painting by numbers (unless you're talented and can paint freestyle of course - one of my friends is very talented this way and when her children were little she'd of an evening do caricatures for people's wedding/new baby gifts), some friends baked, or did batch cooking. Some learned languages or did online courses to prepare for going back to work after mat leave or to try for different jobs. Some would play computer games, do diy, gardening, one took up an interest in photography so would take photos not only of the kids but anything that attracted her attention/looked interesting like ornate architecture features etc and then of an evening play around with different photo filters and printing techniques - think a fair few of those ended up used as gifts too and she won a few local photography competitions (cash prizes too!)
Also boring but time consuming but if money is tight evenings are a good time to create budget spreadsheets and keep them updated. As I say boring in itself but can lead to you freeing up money to do more fun things.
I've recently posted on one of the £10 a day threads too and some ideas on there for things you can do that can also bring in extra money like surveys etc
Anyway hope that's given you some ideas.