Yeah it's touristy but prices have gone up recently - now around €12-14 for 40 minutes around the harbor with city skyline views instead of the old €8 rate. Check current departure schedule and pricing from port vell since costs vary seasonally.

Longer trips covering the coast are around €14+, show you the area from completely different angle. Better than melting on the waterfront in summer heat, especially if you time it right to avoid the premium sunset cruise markup.