The Long Island Railroad is a great source of transportation. There is a station located in the middle of Riverhead.Osborne Avenue and Railroad Street, just North of West Main Street (Route 25).
Also there is a public transit that goes in to multiple places in River head such as the Health center, Railroad, and Tanger outlets. 
Splish Splash water park, 2549 Splish Splash Drive Calverton, NY 11933 (exit 73 of the LIE), ☎ (631) 727-3600, . edit
Long Island Aquarium, 431 East Main Street Riverhead, NY 11901, ☎ 631.208.9200, . Very popular , for all ages. edit
Roanoke Vineyards, 2248 Roanoke Avenue Riverhead, NY 11901, ☎ (631)727-4161. edit This Vineyard has been around for years. People all over the Island come here during the warm weather to drink fine wine and gather with friends.
Riverhead Tanger outlet center, 200 Tanger Mall Dr, Riverhead, NY 11901, ☎ 631) 369-2732, . Riverhead outlet center is located right off exit 71 on LIE. It is a very popular place to visit. People all over come, for the amazing prices with over 100 name brand stores located in this center. edit
Kmart, 605 Old Country Rd Riverhead, NY, ☎ (631) 369-0040, . edit
Bj's Wholesale Club, 607 Old Country Rd Riverhead, NY, ☎ (631) 727-6700, . edit
Toys R Us, 607 Old Country Rd Riverhead, NY, ☎ (631) 727-6700, . edit
Best Western East End, 1830 Route 25, +1 631 369-2200, Fax: +1 631 369-1202, .
Holiday Inn Express Hotel & Suites, 1707 Old Country Rd., +1 631 548-1000, .
Hilton Garden Inn, 2038 Old Country Rd, Riverhead, NY 11901, ☎ 855-277-5057. The Hilton is a very respected hotel. This hotel is in the heart of Riverhead and close to the Tanger Outlets. edit
Hyatt Place Long Island/East End, 451 East Main Street Riverhead, NY 11901, ☎ 631-208-0002, . The Hyatt Place Long Island/East End hotel offers roomy rooms, free Wi-Fi, free a.m. Kitchen Skillet™ hot breakfast with your stay.edit
Riverhead is only a short drive from the Hamptons. Westhampton is filled with things to do. There is a bunch of beaches. The most common one is Cupsauge beach. Dune Road Westhampton Beach, NY 11978.Along with that there are many attractions to visit. In the town there is a list of restaurants and shops.Which is all located on Main st.