Hi blurredlines:
DD1 was slow to take to reading and I fear there are no easy solutions - but here are a few tricks that worked:
Local libraries often run reading competitions in the summer (may be an idea to join in) - they also have activity days for primary school aged children.
when you visit places - look for activity sheets (restaurants, historic properties, museums, etc...) These worksheets/ books often involve a lot of reading.
When you visit somewhere like a museum or a castle - look in the gift shop. Often there are colouring books which also involve a lot of reading (so maybe a colouring book which includes all sorts of facts about castles or the Romans).
Some of the books have competitions - Rainbow Magic Fairies, but others - and that can be fun.
Don't rule out children's magazines related to tv shows - often there is a lot of reading/ educational activities in them.
Don't rule out comics/ pictographic novels. DD1 begged for a Pokemon cartoon book which I finally caved into - and she learned words like 'arch nemesis' which she used again at the start of the school year when she was seated at her 'starter table' with a girl she finds very difficult - she came home bursting with news about 'Mum, you wont' believe it, I've been sat with my 'arch nemesis' XXXXX.' I felt I owed Pokemon an apology really.
Try and incorporate reading time into your day (we find it great right after bath time and before bed). DH and I have childhood favourites and we've been reading to the girls as much as they've been reading to us. We find sharing out the reading makes it much less 'hard work' and the girls see that we enjoy these stories. It's a chance to read stories to them that they may not be able to read to you, but are old enough to enjoy: Oldies but goodies like: Charlotte's Web, Wind in the Willows, Pippi Longstocking, A Christmas Carol, etc.. and new series like Lemony Snicket, Harry Potter, etc...
I try to let each girl read a little bit (even if it was only 'Harry Potter' and 'Hermione' in some passages from my youngest) - but let them just listen and enjoy.
HTH