Bang Rak
Bang Rak puts you on the western and northern edge of the park, and most hotels near Lumphini Park in this area are a 7 or 8 minute walk from the gates. The Ritz Carlton Bangkok (440 m) is the closest of the whole shortlist, with a 4.6 guest score from 272 reviews. The Cotton Saladaeng Hotel (500 m, 4.5 from 436 reviews) and At Ease Saladaeng By Aetas (460 m) sit on the same side, so a dawn lap of the lake before breakfast is easy.
Sathorn
From Sathorn you approach Lumphini from the south-west, past the towers that ring the park. Dusit Thani Bangkok (520 m, 4.7 from 454 reviews) and So Bangkok Hotel (500 m, 4.6 from 6358 reviews) are both 8 minutes on foot, handy for the dusk loop when joggers pack the 2.5 km path. Twenty one BKK House (520 m) is in Bang Kapi, also 8 minutes from the park.