things to do in Latvia

Hello! I am planning to visit Latvia in summer, probably July, would love to hear recommendations for things to do for a solo traveler, I was planning to hike from Riga to Jūrmala so probably be spending a few days in these cities. Would love to visit some unique museums, bars and maybe some kind of house/techno event. I am very flexible with dates so any suggestions would be great! Best wishes from 🇱🇹