I bought a Princess (Disney) bicycle when the first was just under one. It's on the patio (they were just here for lunch with their Mom) and they get on the tricycles and don't bother with the bicycle. It came with training wheels, has a Cinderella coach for a basket, and all the cute stuff, streamers, bell, etc. They also have a motorized jeep and a coupe at home, plus more bikes and a set of tricycles. Too much stuff! We had lunch and tea on the patio today, even though it's a bit cool because they love running around my back yard. They filled the bird feeders twice, pulled along a little wagon, crawled around on the deck under my pagoda shelter - I keep it lowered when not using to protect it from wind, but they can stand up in it when it's down.
A swingset will be perfect for next summer, but we will need one for both houses. Younger daughter already has dibs on buying that. My neighbors have a trampoline (for kids) that they are welcome to use anytime.
Anyway, while writing this, the phone rang and the girls want 'anything Peppa Pig'. So,
Amazon is filled with options at the moment so I'll order a couple of playsets and some figures, and then fill in from there. Costco also has the Wellie Wishers dolls - not sure I want to buy those but I know they will play with them.