There’s a bunch of parks you can walk around like the one on deal road. You can go to asbury park which is about 2 minutes away from deal. I recently added a bunch of things to do on mikomos in asbury park, like the boardwalk, cycling, pinball museum, glass making, and mini-golf. There’s also a boardwalk by pier village which is pretty nice.
Of course, you also have the beach, in the daytime I would go to hathaway ave as its most likely to be empty, Darlington ave or long branch at night.
Restaurants I like in deal, Down to Earth in allenhurst (healthy dairy), Ike’s Meathouse has the best deli style food around and they give really full sandwiches, 656 is a fancy restaurant but not really so worth it, stingers is the kosher bar attached to 656, or the J-Cafe in the JCC on Grant ave.
There is also Monmouth mall not so far away or you can go to Jersey Premium outlets about 10 minutes away.
Common hotels are the Ocean Place, and the Sheraton in eatontown.
If you need any other advice, ask away.