I can highly recommend the café having been twice. On my second visit they stopped serving food at 2pm so might be worth checking if you do plan on a visit. Their Facebook page states opening hours are 9.30am to 4pm and 10am on Sundays.
To find Welland Park you can use the postcode LE16 9DR but it is signposted.
For those that love running Parkrun is here every Saturday at 9am and it is a very popular place for dog walkers.