For under $200, the JBL PartyBox On-The-Go is a great option. It offers good sound quality, Bluetooth connectivity, and fun LED lights. It's also splash-proof, which can be important for outdoor use. Another option could be the Anker Soundcore Rave Neo; it's affordable, has decent bass, and includes party lights. Waterproofing is helpful for unexpected weather but not essential if you're careful.