Focus on your DIL not just the baby. (For goodness sake don’t say Hi and then grab the baby)
Offer help but don’t insist if it’s politely declined.
Avoid competitive Grandparenting. Which Grandmother holds the baby first is entirely irrelevant.
Don’t criticise the parents to the child.
Don’t criticise the other Grandparents (in fact if you aren’t already, make an effort to make friends with them(
Dont criticise whichever name they pick, even if it isn’t to your taste, even if they named the baby after someone on her side and not yours.
Don’t buy huge toys that won’t fit in their house.
spending the most money won’t make you the favourite Grandparents.
Offer sensible and sensitive advice WHEN ASKED.
Follow the parents’ rules (even if they are different to the ones you followed, it’s been 30 years, views change)
Remember that you have entirely forgotten how hard it is.
Most of all, be easy and restful to be around. Grandparents who get the most visits/time with Grandchildren are positive, relaxed, happy people who play with the kids or pitch in and help as required. If every visit with you causes drama you’ll see them less.