The main attractions are definitely the reef and water based activities (fishing, snorkelling, diving, boating). Whales will still be around and the lighthouse lookout at sunset is a great spot to go. The snorkelling beaches are around in the national park ~45 minutes from town. There are also nice creeks/gorges near town and in the national park. There are nice swimming beaches in/near town.

See tours available on visitor centre website:
http://www.visitningaloo.com.au/tours

See attractions on visitor centre website:

http://www.visitningaloo.com.au/things-to-see-do
http://www.visitningaloo.com.au/our-region

Boat hire

There are 3 companies that hire boats in Exmouth. Visit the links below to view:

www.exmouthboathire.com
www.ningalooreefboathireexmouth.com
www.bbitexmouthboathire.com.au