I'm not really in the market for a tricycle, but I am thinking about getting a bicycle. Any experts here?

I doubt I'll get into riding very hardcore at all, so I just want to spend enough to get me something that won't let me down during my leisurely rides on paved trails only. What should I be looking for, or what models would you recommend specifically? I can get something worthwhile for under $300, right?
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SuperGrand UltraDeluxe (Plus Extra More)