We got a lot of mileage from the Ikea Busa tent and tunnel (still do at 4YO). A mini basketball hoop kept me engaged as much as it did my daughter: https://www.amazon.com/dp/B01C5A2WJO/ref=cm_sw_r_apan_glt_fabc_YXEN2TJJ3BCR25N2EP57
We also had these bolster-type-things: Https://www.amazon.com/dp/B01GAAGCWS/ref=cm_sw_r_apan_glt_fabc_QPE94FKF30RN4QX0GGMA?_encoding=UTF8&psc=1
On the pricey side, but super versatile and good for developing mobility skills.