Had a week in Looe about 4 weeks ago, same plan as you, pack the spinning and float rods and sneek in a couple of sessions, however finding marks to fish proved to be a challenge. Fishing off Looe pier is banned during the summer season, you can fish a mark opposite, the white rock, and it's straight into deep water. Looe beach looks ok but it's crowded. The coastal path heading west out of Looe offers some good rock marks but it is mountain goat territory. I walked down from our site to a couple of rocky beaches at Talland Beach where the locals were plugging for bass, saw 4 being caught, it is a steep decend but it can be reached by car, however the roads are single track and they can be a nightmare in the peak season.
The best mark I found was Millendreath Pier which is is just to the east of Looe where you can fish onto sand or rocks, had success on the float with wrasse and pollack and caught a few mackerel when spinning. There are a couple of shops in Looe that sell frozen bait whilst you can dig lug further up the river. Hope this helps and I must say Looe is a great town and you should enjoy your stay.